I think one of the major things holding back map design for paintball is quality textures for specific structures. People are forced to use generic metal textures or some other weird things to sort of get the effect they want, when really, you need a new texture. If you want to make a dumpster, you need a texture of a dumpster. Using some generic metal texture just ends up looking cheesy.
So, if you have a great idea for a map, but need new textures, post requests here. I might already have something like what you need or be able to make it fairly easily. Perhaps somebody else might also be able to make one.