Advice on science oriented tattoos

[flamingnerd]

Hi all, i'd like to solicit some advice.

i really really want a huge backpiece and i want it to make it geeky enough that it'd turn on any real scientist. So...

1. i want to see your science themed tattoos (if you don't mind)

2. are there any cool illustrations that come to mind that you could post a link to or describe?

ideas i've got so far:

maybe something like this, but drawn to fit a back:



or like a periodic table

or a wicked looking microscopic organism

or a modernized da vinci dude in a circle (actually -make that dudette)

in case you're wondering exactly what kind of geek i am... i've got my BSc in Biochem, though i'm going to get a PhD in physiology. (basically biochem integrated into the cellular/systems level) i'm really into medical type research as well. my area of future research is unknown at present.

thanks for your help!