I always put Christmas socks, chocolate coins and a satsuma in my 2's stockings. Then 3 small gifts, some things from the poundshop and chocolate.
I find it so easy to get small gifts for my dd (7) - I've already picked up things for her in the sales. I've got one thing for my ds (12) - a light up lego key ring but find it much harder to get him things.
What do you put in your dc's stockings?