This may have already been answered, but I could not find it with a search of either google or the forums. I want to take various drawn maps and put them in hammer editor in such a way as to allow me to build on top of them, without them actually being in the map. Like changing the background color from black to something else, but the something else is a picture. If this is not possible, it will take me significantly longer to block out my map, so any help is appreciated. Thanks.