I have a possible order for 100 mini individual sandcastle cakes....I'm stumped on how I could do this the easiest way possible....any ideas?

Ok this got me thinking so just an idea! I'm thinking mini cakes like cupcakes(?)

You could hollow a small piece out the center, rather than it being regular cylinder shape angle the knife so you get a graduated cylinder shape so when it's turned upside down it looks like a sandcastle made from a bucket, fill hole with filling, pop bucket shape 'sandcastle' upside down on top and do some detail like mini fondant or royal icing spade and starfish?!!

Taa Daa!

If you get what I mean!
Lol! Just thinking out loud!