Re-Reading my last post, I didn't mention enough that the cake-bit was GOOD. The frosting, it was not for me, but the cake was for me. Meat in cupcakes is a Good Idea (see: bacon cupcakes, corned beef cupcakes).
So, in conclusion: Meat cake = good. Vegetable frosting = less good.
I'm thinking mustardy frosting would be interesting. Again, maybe not 'good', but 'a unique culinary experience'.