vincentvanbuck: You can absolutely participate using handmade art! Just make sure you use the correct proportions to match whatever template we get. A typical poker deck has 2.5x3.5" cards, but the art will need to be a little bigger, probably 2.75x3.75" (or twice that size and then shrink it after scanning, like they do with comic book art). This link does a good job showing how the edges of the art are set up for printing: http://www.printerstudio.com/dl/pc-guide/poker-size.pdf
When you're done with the art, you'll need to scan it at a high resolution and save it as a particular file type. If you don't have a good scanner, your local public library probably does. (Other places like big-box office stores or mail/copy shops will, too, for the right price.) You might need to color-correct or make other minor adjustments, but I'm sure someone could help with that if necessary.