birthday planning

I'll be turning 30-something in January, and I'm at that point where every additional year feels like one year closer to oblivion etc. So I've been thinking about doing something to celebrate/memorialize the occasion and it came to me -  a tattoo.

Now all I need to figure it out a) where and b) what.

i had the idea that maybe i could start with a hydrogen atom model (below, minus all the words and shading), an idea because hydrogen is the most common element in the universe, we're all made up from hydrogen and other various star stuff, and we're all entirely, imperfectly, unique. 

or, you know, something else.