The Lancashire based company below recycle old wellington boots.

www.smile-plastics.co.uk

Use them to plant stuff in

Why can’t they be used again at next years festival? Just group them into sizes and pile them into great heaps. One pound or two a pair. Raise some money for charity or struggling local musicians.

Offer on your local Freecycle site!

Offer them to your local foodbank - the poor need to wade through mud too!

I was surfing the internet and found a great Finnish website. Among other things I found this brilliant way of recycling boots. You don´t have to understand Swedish or Finnish just look at the pictures.
http://stromso.yle.fi/hobbyartikel.php?id=1831
If the boots upperpart has hole in it just cut the upperpart away and use that to make bag and use the lower part as some kind of slippers to use in the garden we call it “túttur” here in Iceland.
Greetings Helen Sím.

Cut off the top part and they can be worn as regular shoos.
You can even decorate them.

Place couple of big once by the door to scare away criminals.

If you go into sea water only knee deep, because you are afraid of shark bites and jelly fish, or sharp stones, then wear them there, and offer to others.

Fill them with water and keep in a big freezer, when its half empty. Filled freezer is more efficient.

Line with plastic bag and ferment vegetables in them: cabbage, cucumbers, apples, etc.

Store glass vases, vessels in them to prevent breakage.

Attach long round handle to the front, and water your plants.

Use as container for anything.

Make hall somewhere on a willie and a pet rodent ore even cat will love it as a toy or a house.

Make your garden scare crow happy by gifting it with a pair of willies.

Make a collection of different foot prints willies create. To do this, paint the soles with ink, and make imprint on a paper. Gather pictures into an album, or frame and decorate the house.

Poor warm water with Epsom salt into willies and soak your feet. You can even walk around, while soaking the feet.