The recent posts about Julie the Clown brought back memories of the amazingly large cakes she made.

Nobody else seems to have followed in JtheC's footsteps. Has anyone tried this? I'm stumped how to go about making a large cake full of sticky mix that is sufficiently stable. Julie's cakes withstood her husband Charlie's repeated dunking of her clowny face - I think she must have used some sort of large sponge (literally sponge foam) that was decorated.

Any tips or suggestions?

I made a 3ft one in my clown vid with catrina with sponge foam

She actually did a post a long time ago where she showed how to make them. They are made using sponge packing foam. Get a big sheet of the stuff from a hardware store, cut a big circle for the base, and a large rectangle for the cake 'wall'. Attach the wall on to the base, so you end up with a sort of cylinder shaped bucket. (I think Julie used staples, although I imagine these could hurt if you sat on one so not sure how that would work... Maybe use fabric glue.)
Next, fill the cylinder you've created with shaving foam. You can use poster paint mixed with shaving foam to create coloured foam. This can then be used to 'ice' the outside of the 'cake', to give it the appearance of being made completely from shaving cream. Then use another colour of shaving foam in a piping bag to create swirly details as you would with a real cake. With skill, you can also make double tiered cakes too.
Once you've done all the above, all that is needed is for your sexy female clown to plant her head or her butt in it!!!

Upholstery foam about an inch thick would be ideal (tends to be blue or green these days but you can get yellow)

Alternatives to staples would be a strong contact adhesive (like Unibond) or stitching the foam together with a cotton thread and a sail-making needle.

If you're really ambitious you could mould an integral sponge foam 'bowl' from scratch using self-skinning flexible PU foam from a supplier like Tiranti's in the U.K. Coat a round washing up bowl with Vaseline, mix the two parts together and swill it around the inside of the bowl. Once set - remove your flexible 'cake' sponge container et voila! Decorate and fill it with whatever you like and reuse.