I did these for my High-School graduation and I want to say that these are easy, but that's only if you have 3-4 hours of spare time and the patience to do so (My recommendation; pick out a new TV Show to watch--I recommend Grimm or Once Upon a Time).
So, to begin, pick out 3-4 colors you'd like to use (I chose to stick with greens). Then, (after a base-coat, of course) start by laying down your first layer of tape in the shape of a triangle on the tip of your nail.
Tips:
One nail at a time.
Tape, paint, then peel off the tape immediately.
The longer you let it sit the more likely it is to mess up and peel off what you painted on.
After you finish the first layer, and after it's dry (this is important because the polish will come off with the tape if it's not dry enough), you can start the next layer the same way you did the first:
One at a time--tape, paint, peel.
Once you do the first round of triangles it's pretty easy to get a system down for the other three or four layers you have to do (I did mention patience, right?).
And, if you're going to do exactly what I did, you'll go through, about, sixty pieces of tape.
Colors:
Jade is the new Black - OPI
Here Today ... Aragon Tomorrow - OPI
Wild Thing - Pure Ice
Cafe Au Lait - Sally Hansen
(Cafe Au Lait is a nude color polish
that I chose to use since my natural
nails get discolored)