I started with a white base before using striping tape to mark off the squares. I used the bottle brushes to carefully paint each coloured square - you definitely need steady hands for this! The colours I used are OPI Done Out in Deco (lilac), OPI Banana Bandanna (yellow), Revlon Minted (green), and a random Color Club pink that doesn't seem to have a name.
I'm pretty pleased with how this turned out, but if you look closely you can see the white bled a bit on my index and little fingers. Boo. Oh well, you can't tell from a distance. :)