hmm for the 10 year old I would go with hair stuff, gloves, bangles (do they wear them at that age now - I remember my friends having them) socks, bubble bath, nice soap, bath bombs, pretty notepad, pretty pens/pencils
boy - gosh, no ideas I'm afraid. can remember being a 10 year old girl (just about) and have girls but no ideas with boys
2 year old - will be doing this one myself. I am making her fleecy hat with integral scarf and mittens, little books (the little library ones like ITNG etc) and that is about as far as I have got. crayons maybe and small pad. generally though I am thinking about half avoiding stockings and actually just putting all their presents in the stocking under the tree. bit of a cop out I know but they get given SO much that I really don't want to get into havign to buy lots of extra stuff on top of it. we could get away with that though as the 2 year old is our eldest so they don't know any different