So I picked out my most hippie-est and went as a Hippie!
A lot of this stuff is long gone from Soul Flower's website, but you can still get a few of them (the Peace Fingers tee is new):
I didn't buy anything new for this costume, and got dressed in literally 5 minutes. This ended up being one of my most favorite Halloween costumes, and probably THE most comfortable. Can't go wrong being a cute hippie! :D