I have been trying for days to figure this one out; maybe someone out there can help me.

I'm planning to make a mushroom cake and I have this idea in my mind that the BOTTOM of the mushroom cap tier needs to have a gentle wave to it. I do not want it flat on the bottom.

I've made a pillow cake, so carving the cake does not scare me. But what the heck can I use for a cake board, to support the tier so it holds its shape?

The only ideas I've had (all of them bad!) are these:

1. An old 45 music record, somehow melted and warped similar to the shape I'd need. (This would have the advantage of having a hole in the middle for dowling the cake. I'm thinking maybe I could cover the record with multiple layers of plastic wrap OR seal it with a coat of food-safe varnish.)

2. Making something out of paper mache and then sealing it with food-safe varnish or plastic wrap.

3. Buying a piece of metal and cutting with tin snips, and trying to bend it into the shape I want. Bt then how would I put the hole in the middle? (I'm not so skilled with power tools... nor do I actually own any!

4. Going to the local acrylic and glass shop, so see if they can custom-make something for me (I probably couldn't afford it, though!)

5. Taking the lid of a cheap round tin, and trying to form it into the correct shape ... but then I'd need to put a hole in the middle of it and like I said before, I'm not sure how to do that.

Anybody ever done something like this before, or have any ideas or advice for me?

Thanks in advance!

Put the cake on a flat board then form the "wave" part out of rice krispy treats glued to the bottom of the board with chocolate or white chocolate.