Here is a picture from a couple months ago of a polish jobby I'm still really proud of. Unfortunately it did not last too long, because I used black nail art tape directly on the nail. It pealed up pretty quickly, within a few days. But until then I recieved more compliments on my nails than I ever had before (or since).
I panted my nails white, then used a topcoat of SV. Once that dried, I blocked off part of the nail with scotch tape and I used a mixture of Milani and Nail Inc neons to paint in sections. Then I applied the black tape and slapped on another coat of SV and ta da!