I have a lot of earrings. Some are not really my style(because I got them as a present of something like that), so I decided to pimp them :D
You only need an old pair of earrings and some nail polish(every colour you like, I used red, blue, pink, purple and white).
Tip: I needs to dry a long time, so don't touch it for a couple of hours, because that will destroy your earrings ;)