I would use one piece of white fondant and paint or airbrush the color areas on.
What a great idea for a cake. I am not a pro, but I would roll out the pink as a base, find the center of the cake and then use the center as my starting point for each piece of the green. Hope that helps ya!
I would definitely use 4 separate pieces of fondant. That way the color will be even and all of the sections will be the same height as each other.
Texas Rose is right, your pieces will be straight and even cut individually.
Thanks! Texas-Rose, that is exactly what I was worried about...making the sections all even. As far as painting/air brushing: I don't own an air brusher and I can't get the colors light enough with painting.
Now, how do I make the seams apear as seamless as possible?