Dynaride was offering this several years back... i think they are no longer in business... not to say the design your own board thing is not a good idea, but that maybe their boards just were not so great. I think the company was based out of Phoenix Arizona, and i remember the boards being relatively cheap considering the designing option. I belive you would just send a jpeg or gif file and they would sublimate the graphics to the board.
check it out on the boards list for this sites review guide
http://www.wakeworld.com/wwimages/boardguide/boards/99DY282.jpg maybe some day some company will bring this idea back... i would support it with a third thumb up if i had one