These three polishes are super sheer. I had an idea to layer them over one another to see how the colors changed. The polishes I used were OPI Calendar Girl (pink), Sea Ya Later Sailor (blue) and Sit Under the Apple Tree (green).
I tried to make each nail different, by doing the colors in different orders. I love the green over the pink-ish because it makes a a really warm orange. Then the blue over the pink/red makes a slight purple.
My ring finger is my favorite. It's got a bit of a ROY G BV gradient going on. I've got a couple other ideas for layering experiments with these polishes. Hopefully I'll get around to them sooner or later.