I loved working with a stencil, white on white, on a recent wedding cake. Thought I should up the stakes a little and try a colorful one :) It's easy to scrape off white on white icing if it happens to come outside the stencil. Not so much if you use pink on white. It worked out anyway, and I put some flowers on top just to make it less "naked". Next time I will try black stenciling on a white wedding cake :)