Supernan has already mentioned this in the thread on builder's sacks, but this is an ingeneous method of using old hessian type sacks.
Full instructions (and an entry form if you want to enter the comp) can be found at http://www.sendacow.org.uk/
I think I'm going to try the idea for a herb garden with a tumbling tomato in the top. :P
Lillypad
Cool! This looks like fun. Not to mention a challenge. And for a good cause.
What more could you want?
Clare.