Naturally, I'm medium to dark brown and on the cooler side of the spectrum (no red or bronzy tints naturally).
When I went to college, I kept dying it auburn. My hair looked pretty sexy red, if I say so myself. ;) I've since stopped. Constantly dying it is a pain.
I actually used blond hair dye I had lying around the house recently. Since I didn't bleach before I used it, it just lightened my hair a bit. Makes me want to try going blond someday, but that would take effort, so I probably won't.
There's nothing wrong with my brown hair, either. My stepdad said as a kid that my hair was fine as it is, but I always wanted to have orange hair (still haven't tried it lol). A hairdresser once complemented me on my hair color when she was cutting my hair. It felt really nice even if she didn't really mean it for some reason. I've mostly felt my hair color is just plain. But there's nothing wrong with that.
I don't do extensions. Or styling, for that matter. It just is how it is.