Or a link to one perhaps?

I couldn't find many for just rice krispies, but these should work. Just treat the cake as if it were the cereal treats. Not sure how much you'll need but they both started with rounds so you could just fill cake pans with the mix. Good luck :)

http://cupcakeartist.wordpress.com/2013/01/10/patriots-helmet-cake-tutorial-does-cake-bring-good-luck/

http://cakesdecor.com/entries/484-football-helmet-cake-tutorial

Sweetcheekscake-thank you!!

Disregard.....

I thought you were asking about a football.

I apologize.