Index: src/wp-admin/css/media.css
===================================================================
--- src/wp-admin/css/media.css	(revision 41563)
+++ src/wp-admin/css/media.css	(working copy)
@@ -738,6 +738,9 @@
 	box-sizing: border-box;
 	padding: 16px;
 	height: 100%;
+	background-position: 0px 0px, 10px 10px;
+    background-size: 20px 20px;
+    background-image: linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%),linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
 }
 
 .edit-attachment-frame .attachment-media-view .details-image {