craftgrrl | Rubber Stamp -- Custom?

I am thinking about having a rubber stamp made up for a project I'm working on that will involve a repeated skull image -- it's a lot of fabric I have to cover, and I don't really want to do it by hand...

Has anyone ever had a custom stamp made before? Recommended sites? Time/shipment/delivery?

Or, tips on making my own? The last stamp I made was a potato stamp for Halloween cards in, um...grade school?...so easy is great! Someone sugeested fun foam, but I'm a little worried because there are a lot of rounded edges, and every time I try and do something with foam, it look kind of hacked up and torn. (I'm usually pretty crafty and stitchy-witchy, too, so it puzzles me to no end that I can't work with teh stuff!)

Thanks in advance!!
(slightly cross-posted)