You could also do this on the computer, if you wanted to have your sig in back, and a nice border around it.
Just sign a black peice of paper a few times, scan in the one you like with a cheap flatbed, adjust your size in MS paint or whatever, and add a border. Then print it off in a transparency like a teacher uses for overhead projectors, (any university/community college library copy machine prints transparencies), usually about 50 cents each.
If you want a black signature on a white background, you can print the transparencies in silhouette.
I've use transparencies, for particular effects when helping my little girl make photograms.