If you get her/he a gift it should be there favorite animal.
Yes, Sonic the Hedgehog is a good gift for a 17 year old boy.
Gift Cards
a girlfriend
Anything
IPod touch 200.00
If the 11 year old is responsible, it is a good gift. They are a little pricey, so I would base it on how he has treated his other belongings previous to this.
if i had a 15 year old boy i would give him a phone or a labtop
A ring or flowers. Mabye a gift card to a store.
cd's or a ipod
Xboc 360 Ps3
That really depends on what their interests are.
anything involving paint