This one was actually pretty easy, because I've wanted to do this as a manicure for a little while ...
The movie I picked was "Oz the Great and Powerful"
Here is a picture where you can sort of see the manicure in question:
And, here is my version:
I started with one coat of Essence Sweet as Candy for a sheer base.
Then I drew a triangle on my nail with Zoya Envy - an almost-black pine green.
I went over top of that with China Glaze Winter Holly
Finally, I did a line of gold just inside the edges of the triangle - I used my Icing by Claire's gold striping polish.