Do you mean the textures on bricks?
You mean like client ui? Set the pic to read-only in the properties menu that you get by right clicking on the file and clicking on the bottom tab. Badspot doesn't like this way so you might want to use destiny's add-ons, if I can find it I'll link it.Here we go: http://www.mediafire.com/?s3b7nsu0sjgznlu