I am at a loss.

My friend wants me to make a two tiered cake for her son's birthday in January and he's obsessed with Dr. Dreadful.

I googled him and he's a gross mad scientist who makes insects and bubbling brains and goo and monsters etc....

I don't know what to make - all I can think of is to colour white chocolate ganache and pour it over the top to make green "slime".

I'm a beginner cakemaker and any suggestions will be welcome please!