There's a few people around here who do custom work, but they generally charge money. I doubt they'd work in exchange for illustrations (no offense). So you're probably going to have to offer up a cash payment to garner much interest.
Someone was charging $30 to customize stores a while back, but I'm not sure if they are doing it any longer. I believe M is
doing something similar aswell. You could try contacting them to see what it would take.
Hope that helped, and good luck.
**Please Note: This post in no way indicates the author has any idea what he/she is talking about. Take everything said with a grain of salt (followed by a shot of tequila), and it wont bother you as much**