I'm going to get the circle Z tatted on my forearm. I was thinking red Z purple circle. Probably chromatic type shading.

Do you guys think the red and purple will look ok together?

I'd say yes. I've always loved those two colors together, and I tend to associate the entire Ziltoid concept with lots of purples, red and green (obviously). But then, I've only posted on here all of three or four times, so take my opinion with a grain of salt.

Regardless, best of luck with the tattoo!