Well, once I've finished attacking the nettles in my back garden with a strimmer, I'm blowing up my pool and filling it with 200 litres of instant mud. Ideally I'd like to use it a couple of times - I'm using it to film a custom and an idea I have for YouTube - but other than that, I'm pretty stumped.

Inspire me guys.
Pool is about 5"6 in length, long enough for me to lie down in, big enough for two people to sit in comfortably. If you want to know what 200 litres looks like in it - see attached picture. Imagine that, but with instant mud.