Room temperature water (has to be room temperature and it is easier to do this in a bowl then a cup)
nail polish in different colors
A place to let them dry
Firs thing to do is drop some nail polish in the water, if the water is not room temperature then it will sink and you need it to float to work. Try using a tooth pick and swirl around the nail polish to get a different effect. Once you have a pattern you like dip the eggs on the top of the water and roll them around till covered. We tried to use gloves for this but it ended up very slippery and found just wiping hands between dipping eggs worked just find for clean up. Set out to dry in a well vented room and that is it. Me and my daughter both loved this craft and wished we had more spring colors to work with but really they still came out beautiful! Highly recommend for any older kid, they make great room decor.