Check out Deviantart.com, if you haven't already. There are many brilliant graphic artists, hungry for gigs on that site (a lot of junk too, but you scan skip all those quite easily). There's everything from photography, to photomanipulation, to full blown digital art of every kind, website layouts, CSS templates, backgrounds and on and on. Some of them say "help yourself", others have restrictions on use. Either way find someone you like and drop them a line, see if they're willing to work with you.