Here's a sample of my stuff: http://www.youtube.com/user/BrodyWeld (you can find more by googling Little Vision)
I just like the idea of other people rapping on my beats. I will do one revision for each song (i.e. you can listen, make notes of things you'd like changed, and then I'll revise it once). Songs will be min. 1:45 but I'll shoot for at least 2:30. The song will be yours to record over but please credit me as the producer, and feel free to show me the finished product!