If I had any good ideas, I'd probably be using them myself.

Nah, but really, I wish I could help. I think the zombie thing is really overdone, personally. (No offense to people who do it or like it - I still think it's cool.) It would just be kinda nice to see something different. Maybe on the complete opposite of the spectrum - super happy, or crazy, or something. Bright colours, big smiles, and a hint of insanity.
Sorry if that's too vague though. ^^'