Hey /r/atheism, I'm thinking of getting this tattoo, but its kind of plain, any ideas on how to spice it up?

This is the tattoo in question, if it makes any difference this is everything relevant I can think of.

• It's going on the back of one of my shoulders
• I'm not totally against colours, although I'd prefer simple black and maybe another colour
• I'm not an artist, nor am I creative enough to mess around with it myself
• Max size would be roughly 7 inches across and 5 inches high
• It's my first tattoo...

So what do you think?