diff --git a/resources/builtin/missing.png b/resources/builtin/missing.png
new file mode 100644
index 0000000000..f301d02626
Binary files /dev/null and b/resources/builtin/missing.png differ
diff --git a/src/applications/files/query/PhabricatorFileQuery.php b/src/applications/files/query/PhabricatorFileQuery.php
index d5731ac13b..5a110afaf9 100644
--- a/src/applications/files/query/PhabricatorFileQuery.php
+++ b/src/applications/files/query/PhabricatorFileQuery.php
@@ -7,6 +7,7 @@ final class PhabricatorFileQuery
   private $phids;
   private $authorPHIDs;
   private $explicitUploads;
+  private $transforms;
 
   public function withIDs(array $ids) {
     $this->ids = $ids;
@@ -23,6 +24,21 @@ final class PhabricatorFileQuery
     return $this;
   }
 
+  public function withTransforms(array $specs) {
+    foreach ($specs as $spec) {
+      if (!is_array($spec) ||
+          empty($spec['originalPHID']) ||
+          empty($spec['transform'])) {
+        throw new Exception(
+          "Transform specification must be a dictionary with keys ".
+          "'originalPHID' and 'transform'!");
+      }
+    }
+
+    $this->transforms = $specs;
+    return $this;
+  }
+
   public function showOnlyExplicitUploads($explicit_uploads) {
     $this->explicitUploads = $explicit_uploads;
     return $this;
@@ -34,8 +50,9 @@ final class PhabricatorFileQuery
 
     $data = queryfx_all(
       $conn_r,
-      'SELECT * FROM %T f %Q %Q %Q',
+      'SELECT * FROM %T f %Q %Q %Q %Q',
       $table->getTableName(),
+      $this->buildJoinClause($conn_r),
       $this->buildWhereClause($conn_r),
       $this->buildOrderClause($conn_r),
       $this->buildLimitClause($conn_r));
@@ -43,6 +60,19 @@ final class PhabricatorFileQuery
     return $table->loadAllFromArray($data);
   }
 
+  private function buildJoinClause(AphrontDatabaseConnection $conn_r) {
+    $joins = array();
+
+    if ($this->transforms) {
+      $joins[] = qsprintf(
+        $conn_r,
+        'JOIN %T t ON t.transformedPHID = f.phid',
+        id(new PhabricatorTransformedFile())->getTableName());
+    }
+
+    return implode(' ', $joins);
+  }
+
   private function buildWhereClause(AphrontDatabaseConnection $conn_r) {
     $where = array();
 
@@ -51,31 +81,47 @@ final class PhabricatorFileQuery
     if ($this->ids) {
       $where[] = qsprintf(
         $conn_r,
-        'id IN (%Ld)',
+        'f.id IN (%Ld)',
         $this->ids);
     }
 
     if ($this->phids) {
       $where[] = qsprintf(
         $conn_r,
-        'phid IN (%Ls)',
+        'f.phid IN (%Ls)',
         $this->phids);
     }
 
     if ($this->authorPHIDs) {
       $where[] = qsprintf(
         $conn_r,
-        'authorPHID IN (%Ls)',
+        'f.authorPHID IN (%Ls)',
         $this->authorPHIDs);
     }
 
     if ($this->explicitUploads) {
       $where[] = qsprintf(
         $conn_r,
-        'isExplicitUpload = true');
+        'f.isExplicitUpload = true');
+    }
+
+    if ($this->transforms) {
+      $clauses = array();
+      foreach ($this->transforms as $transform) {
+        $clauses[] = qsprintf(
+          $conn_r,
+          '(t.originalPHID = %s AND t.transform = %s)',
+          $transform['originalPHID'],
+          $transform['transform']);
+      }
+      $where[] = qsprintf($conn_r, '(%Q)', implode(') OR (', $clauses));
     }
 
     return $this->formatWhereClause($where);
   }
 
+  protected function getPagingColumn() {
+    return 'f.id';
+  }
+
 }
diff --git a/src/applications/files/storage/PhabricatorFile.php b/src/applications/files/storage/PhabricatorFile.php
index 888d49234c..732ede3de2 100644
--- a/src/applications/files/storage/PhabricatorFile.php
+++ b/src/applications/files/storage/PhabricatorFile.php
@@ -682,6 +682,89 @@ final class PhabricatorFile extends PhabricatorFileDAO
   }
 
 
+  /**
+   * Load (or build) the {@class:PhabricatorFile} objects for builtin file
+   * resources. The builtin mechanism allows files shipped with Phabricator
+   * to be treated like normal files so that APIs do not need to special case
+   * things like default images or deleted files.
+   *
+   * Builtins are located in `resources/builtin/` and identified by their
+   * name.
+   *
+   * @param  PhabricatorUser                Viewing user.
+   * @param  list<string>                   List of builtin file names.
+   * @return dict<string, PhabricatorFile>  Dictionary of named builtins.
+   */
+  public static function loadBuiltins(PhabricatorUser $user, array $names) {
+    $specs = array();
+    foreach ($names as $name) {
+      $specs[] = array(
+        'originalPHID' => PhabricatorPHIDConstants::PHID_VOID,
+        'transform'    => 'builtin:'.$name,
+      );
+    }
+
+    $files = id(new PhabricatorFileQuery())
+      ->setViewer($user)
+      ->withTransforms($specs)
+      ->execute();
+
+    $files = mpull($files, null, 'getName');
+
+    $root = dirname(phutil_get_library_root('phabricator'));
+    $root = $root.'/resources/builtin/';
+
+    $build = array();
+    foreach ($names as $name) {
+      if (isset($files[$name])) {
+        continue;
+      }
+
+      // This is just a sanity check to prevent loading arbitrary files.
+      if (basename($name) != $name) {
+        throw new Exception("Invalid builtin name '{$name}'!");
+      }
+
+      $path = $root.$name;
+
+      if (!Filesystem::pathExists($path)) {
+        throw new Exception("Builtin '{$path}' does not exist!");
+      }
+
+      $data = Filesystem::readFile($path);
+      $params = array(
+        'name' => $name,
+        'ttl'  => time() + (60 * 60 * 24 * 7),
+      );
+
+      $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
+        $file = PhabricatorFile::newFromFileData($data, $params);
+        $xform = id(new PhabricatorTransformedFile())
+          ->setOriginalPHID(PhabricatorPHIDConstants::PHID_VOID)
+          ->setTransform('builtin:'.$name)
+          ->setTransformedPHID($file->getPHID())
+          ->save();
+      unset($unguarded);
+
+      $files[$name] = $file;
+    }
+
+    return $files;
+  }
+
+
+  /**
+   * Convenience wrapper for @{method:loadBuiltins}.
+   *
+   * @param PhabricatorUser   Viewing user.
+   * @param string            Single builtin name to load.
+   * @return PhabricatorFile  Corresponding builtin file.
+   */
+  public static function loadBuiltin(PhabricatorUser $user, $name) {
+    return idx(self::loadBuiltins($user, array($name)), $name);
+  }
+
+
 /* -(  PhabricatorPolicyInterface Implementation  )-------------------------- */
 
 
diff --git a/src/applications/phid/PhabricatorPHIDConstants.php b/src/applications/phid/PhabricatorPHIDConstants.php
index 6ed089f91f..5860ca1c5b 100644
--- a/src/applications/phid/PhabricatorPHIDConstants.php
+++ b/src/applications/phid/PhabricatorPHIDConstants.php
@@ -44,4 +44,7 @@ final class PhabricatorPHIDConstants {
   const PHID_TYPE_XCMT    = 'XCMT';
   const PHID_TYPE_XUSR    = 'XUSR';
 
+  const PHID_TYPE_VOID    = 'VOID';
+  const PHID_VOID         = 'PHID-VOID-00000000000000000000';
+
 }
diff --git a/src/applications/pholio/query/PholioMockQuery.php b/src/applications/pholio/query/PholioMockQuery.php
index d222fed29b..d5ce886eba 100644
--- a/src/applications/pholio/query/PholioMockQuery.php
+++ b/src/applications/pholio/query/PholioMockQuery.php
@@ -129,7 +129,11 @@ final class PholioMockQuery
     }
 
     foreach ($all_images as $image) {
-      $image->attachFile($all_files[$image->getFilePHID()]);
+      $file = idx($all_files, $image->getFilePHID());
+      if (!$file) {
+        $file = PhabricatorFile::loadBuiltin($this->getViewer(), 'missing.png');
+      }
+      $image->attachFile($file);
       if ($this->needInlineComments) {
         $inlines = idx($all_images, $image->getID(), array());
         $image->attachInlineComments($inlines);
@@ -151,7 +155,11 @@ final class PholioMockQuery
       $cover_file_phids), null, 'getPHID');
 
     foreach ($mocks as $mock) {
-      $mock->attachCoverFile($cover_files[$mock->getCoverPHID()]);
+      $file = idx($cover_files, $mock->getCoverPHID());
+      if (!$file) {
+        $file = PhabricatorFile::loadBuiltin($this->getViewer(), 'missing.png');
+      }
+      $mock->attachCoverFile($file);
     }
   }