Twins for Peace was started by two friends in 2009, with an idea similar to Tom's in the US: Buy a pair, give a pair. Sounds like a win-win to us! We get an amazingly cool pair of sneaks [love the ones above!] and get to help out a kid in need. And as sneakers are all the rage right now, you can be fashionable chic and comfy too.
Twins for Peace
5, rue Commines, 3rd
Also at Colette and Le Bon Marche in Paris