Really wasn't sure where to stick this and I do apologize if I've somehow made a double post. This was just too cool and I couldn't help but share this with you.

I myself have dabbled with nail designs and quite enjoy doing acrylic work but I think this could go on both natural and extensions. She's got some awesome tutorial videos up but this is a favorite of mine. I'm sure you can use whatever polish you prefer for it so it's highly customizable. Enjoy!