I was going to say exactly the same thing about the concert tickets. My boy's bday is next week and he LOOOVES Alicia Keys, so I've bought him tickets to see her in concert, I know he is totally going to love it. If theres a concert or game or anything on in the near future your boy would like, its always a welcomed present i think! The jewellery idea is also a good one, or a nice wallet if he doesnt already have one?
'Be who you are and say what you feel because those who mind don't matter, and those who matter don't mind'