I think this is actually the first custom paint job that I ever did on one of my bits of hardware several years ago. When I was younger I used to spend many hours painting, modding and playing Warhammer 40000 (along with various other Games Workshop creations). Although I don't play it any more I still love the whole Warhammer 40000 Universe and the artwork along with it is equally as impressive.
I didn't create the design itself, which was actually copied from a Warhammer 40000 calendar I picked up at a local store - if I remember correctly I actually got it for free mid way through the year. I could probably do a better job (or at least get closer to the original) now that I have an airbrush but I'm still pretty happy with the final result.