Brains and also little synapses. I like the brain earrings, but I wish I could get post earrings without the brain stem. I know it’s important and helps you breathe and stuff, but it’s not very aesthetic.
A DNA pendant (see p.2, they won’t let me link directly) sure would be pretty, though. Nice aesthetic design on the part of all those genes.
I also like the rainbow squooshy brain (in bestsellers).