I went to Camp Hollywood one year in L.A. and there was a vendor there who took old soda bottle caps and made them into hair clips. I bought two pair for a ridiculous amount of money.
I started looking at bottle caps in a crafty way after that. Now, I, being a cheap date and a girly drinker, saw all sorts of fun bottle caps! These Jack Daniels caps, Sierra Nevada, Smirnoff (which are fun because they come in a handful of colors), and Anchor Steam Brewing had the best bottle caps with little anchors on them!