Keith Herzik is an inventive artist who I once traded posters with, and I think I got the better end of the bargain. His messy, sometimes creepy venue posters are vibrant, fun, and singularly him. Check out his website which also features some of his other non-gig drawings, and his posters on Gigposters, where I first saw his work.
He hand prints all his work, which makes me a bit envious. Why not make me more envious and get in touch with him to do some art for you? You have a band right? (By the way I don't know him and he may not, after all, want everyone contacting him–but try it anyway).