Check the cake boards (although I haven't seen anything on it, and the cake board picture thread hasn't had a new picture added in about a year as of the last time I looked a few weeks ago...)
Alternatively, if you can come up with an idea and either describe or draw it, there is the possibility that they can do it. There may be an edible image they can do or (for a premium) you can have a "fancy fondant" cake created. Call the cake hotline, and see what they can do for you!