I was just at a wedding this past weekend and they cut the cake and did pictures of it before they even ate dinner. Thought that was a great idea. That way it was done, and the guests could then help themselves afterward.
When I did mine, I used a doctored cake mix and filled each pan about 1/2 full. It used the full cake mix. And also, I just used white chocolate chips and tinted them pick and painted the bottom pan. Worked like a charm.Hope that helps.