How to remove app images from gallery
Those apps probably cached the images on the sdcard. You can go though and delete the cache for the applications. Some could be in /sdcard/android/&lt;package-name&gt;/, some apps may just create a directory somewhere on the sdcard root.

You can also look at unwanted folders showing up in gallery (bejeweled 2). can they be removed?. It will tell you how to stop images from showing in the gallery, if you still have the application installed.