I need photoshop help!

[Aliantha]

I have a cake next week and the customer wants an island style tattoo design on it. I have a way to do it, and the design here, but I need someone to fill in the white bits with mint green.

If anyone can help with this, can you give me your email address and I'll send it along.

It's times like these I wish I had photoshop and may need to invest in it sooner or later.

Basically it's a black tattoo which is going on a mint green cake, so I need to do the background of the tattoo mint green so I can then get an edible image printed and attach it to the cake.

Please help me. I'm dying here.