I've seen this mani on a few blogs lately and I wanted to try it out as well, I think it gives a pretty cool result :) I used Catrice Sea of Green as base, when it was dry I taped it off, added another color, removed the tape and let it dry again. Rinse and repeat, then added some top coat and then I ended up with this:
Top right: Catrice Sea of Green
Botton left: H&M Green
Botton Right: China Glaze Watermelon Rind
For more tape ideas, have a look at Chloe's Nails, she does great stuff with it!
Have a nice day :)