When you challenge some one...you the challenger can supply anything you want to the person or group. If you have a sketch, mesh, character, or scene file that you want them/us to use that's fine.there's realy no restrictions on how to make your challenge except lets try not to get to extreme like "I want you to make an image of a Clown and a goat laying on a rubber sheet with nothing but a garden hose and cooking oil." Although that is kinda funny it really doesn't need to be seen:O) GeorgeD