Bravo, Gene G., for your brilliant entrepreneurial enticements.
A few suggestions:
(1) Use the canvas to tie up the cheerleader and paint directly onto her skin, in a combination painting/performance art/ pornography "collaboration". Forget the hoped-for wardrobe malfunction - instead, just make it happen intentionally, as a part of the promo. You just can't beat the revenue generating power of socially engineered malfunctions.
(2) In conjunction with this, stage a protest-art happening, where you load a paintbrush and walk around crossing out all the numbers on the football players uniforms. And sign your name, while you're at it. Big time name exposure for YOU, as well as the other exposure that we have alluded to.
(3) Offer half-off beer and peanuts to all future games, for the person who successfully posts the most pics of your antics to YouTube. Chances are, nobody will take you up on the offer, so you can avoid this expense entirely, instead just going through the motions to appear legitimate.