Water Nail Marbling Technique

I saw this Youtube video last week and thought it was so cool.  Basically you drop your nail polish into water and create a design and dunk you fingers in it and creates designs like these....  this picture is not mine.  I found it on google search.  But wanted to give you an idea.

Anyhow... it seems like a simple idea.  I gotta try it out sometime.   Here's a how to video I saw from youtube.