Fleur, I found one made of pallets, which are usually destroyed and not recycled, on the Instructables website. Here's the link:
Pallet Compost Bin I've got mine made and am starting up with some of the leftovers that have been sitting in our fridge. You can use any type of vegetable matter that hasn't had chemicals on it or hasn't been cooked with meat or oil. I had some strawberries that had molded so those went in the bin as well as some egg shells and coffee grounds. You should layer your items to start with and it doesn't matter which way it goes. Like this:
1. green stuff -grass clippings, pinched off spent flowers
2. brown stuff- shredded, raked up leaves, hay or straw
and so on.
I'm sure there's a list somewhere on the internet of what you can and can't put in a compost bin but I just haven't searched for it.
You do have to turn it a couple of times a week and keep it moist so things can decompose. Oh, and you can also put manure (cow, horse, sheep, chicken) in it also. It does stink so make sure you put the bin away from your house somewhere.