Caevrane's Assets contains various assets (mostly custom textures) that could help you make a great map!
I also make Icons, Wireframes, Loading Screens, and all sorts of .tga and .dds images. PM me if you need any of those!
Please, do not steal credit, if you're going to modify some of this assets, please give me credit of the original asset in question.
Complete Screenshot list in: http://imgur.com/XGTfkuJ,BkSMvTa,onQKyj8,ZKFJOw6,owBGCRu,WfPoYk0,mFq6V4Z,vd7qd3x,YUDyyER,lsksVJI,Yke7tWh#10