How about an online challenge where students have to use graphic design software to create a VEX t-shirt? Sell the winning shirt design at Worlds.
Also, someone with graphic design skills needs to create a t-shirt that has a clawbot and Starstruck stars on it… “Reach for the stars!”
Almost like this one 
That could be a cool challenge, definitely something to look at. I am not to sure what it would be based off of because, I think that after a while you will be finding a lot of really good looking and funny shirts…
Good Idea Either Way.