I have loads of studs and so far pale peacock works best, even better than strong peacock. Somehow that bit of pink in the centre really helps the earrings to pop. I think light purple, bright green and pale blue are fine too, but they can be really hard to find. I've some studs with a bit of diamonds in the settings and the diamonds do help the earrings to pop as well.
I usually tie my hair in a ponytail and that helps with dangles.