G.W.
ONe thing my kids do, and it may or may not work for you: they sort the clean clothes into three baskets - adults, kids, and linens (towels, dishcloths, sheets, etc.) This may seem like a silly extra step, but when folding clothes it makes a LOT fewer piles while you're doing it and if you are in need of another chore to do, this would work.
Also, what about pulling weeds?
And, one more idea, what about doing good deeds for neighbors for no extra pay, but just to serve others? It would be a nice way for him to learn about giving to others just for the sake of giving. Just an idea.