Logos on the 'bot and tshirts, for one of our sponsors (MV Transportation) we have hats with the MV logo on them.
Our team leader wants to get all the sponsor logos waterjetted into this year's 'bot's chassis...

I think it'd be cool too but I'd worry about rigidity (wait a tic... we removed 90% of the material from one of last year's supports and it was barely affected... I could still stand on it).