This is a design I saw on Leslie over at Polish Art Addiction. I loved the design so much that I had to recreate it. My blue colour is more teal than hers but otherwise it's the same. I used a base of Picture Polish Bright White, then sponged the nail with both white and OPI Fly. I then stamped in black using BM12. I execution is not as neat as Leslie's, but I was still very happy with the result.
It was only after I had done the design that I realised it matched one of the tops I wear to work perfectly.