I have only done this once and it only worked for like an hour. 

This is to change eye color.

All you need is a pink candle.

Wait untill its dark out (or at least be in a really dark room) light the candle

Meditate, imagine yourself with the new eye color.

When you can completely see yourself with the new color open your eyes.

Like i said it only lasted like an hour, it was neat though, it was the first "spell" i ever did.