Crafty Tattoos

My sister and I are getting tattoos on our wrists together as a Christmas present to each other, (already got our noses pierced together, she wants to do this also as a "bonding" thing.) Anyway, She is getting the Pi symbol (she is a math dork) and as my thing is crafting, mainly jewelry making, I am trying to get some ideas. If you have a tattoo that showcases this, can I see a picture, or if you have a cool drawing or pictures that would work as a tat, or any ideas in general, I would appreciate it. I am trying to come up with my own original idea but inspiration is always appreciated.