Pin Design For Book Promotion

I'm in the process of creating a line of 2 1/4" "pinbacks" (aka "buttons") for promotion of a book and am looking for designs. I'm looking to pay up to $5 USD per design. The total budget on this project is $20, so that would be 4 designs @ $5 each. These designs should not violate any U.S. copyrights and/or trademarks. The designs should be sent as Adobe Illustrator (AI or EPS) files (see attached template). There is no limit on the amount of colors used. I will email the winning bidder specifics. To be considered, submit either a link to your portfolio or attach a few examples. To clear up any possible confusion, I am NOT looking for web graphics or web "buttons". If you have any questions, PM me.