It's rough, but you get the idea. Broom outline from here. Obviously, if this were to go on a real shirt, I wouldn't steal someone's artwork (borrow, really).
Speaking of stealing artwork, this is a pretty cool shirt idea (cf.):
Ideally, I'd like to have a site where people make their own t-shirts, but on a different model than cafepress or threadless. I'm still working on the details.