Sure, I can do this. Have you decided on sizes (width/heigh) you need?
Send me an email with specs and stuff at 
I don't know, just tip me later if you'll like the result. Whatever amount feels right to you. Like you know - donation buttons on these indie games site, where you can type any amount in there and donate it to a game creator ("pay what you think is fair for the game") :) I like that system.