While Anne is skilled at fairly complicated and exciting nail techniques, I am something of a simple girl. Simple meaning I wish I could do all that shiz, but I'm just not as talented or patient as she is. That's why I love Layla's Hologram Effect Nail Polish($15.50). The kit comes with a two-sided buffing stick and a pretty polish. Instructions: Buff polish-free nails with the pink side of the stick, then buff with the white side, then paint. Repeat.
I did that with a blue called Ocean Rush. I now have shimmering, hologram nails that give off a rainbow sheen when I move -- it's very fun.
You can pick it up in your local drugstore or online. And then you will totally have mermaid nails.