For each kids' birthday and Xmas, our pattern has been to get one "big" gift and a few smaller gifts, but it has reached the point that I literally cannot think of a "big" gift for my son's 15th birthday. He needs nothing and wants only things we won't get for him (i.e. an Xbox). True badassity would be just giving smaller gifts, but we like giving a larger gift and can afford it. At least rather than scramble for something dumb, I opened up a Sharebuilder account for him and am buying him a share of Apple stock and a share of Berkshire Hathaway stock. (He is interested in investing and is a good saver, so he'll probably appreciate this.) Bonus - for opening the account, I get a $50 cash bonus deposited after making the first trade.
Having said all that, anyone have any good idea for small gifts for a teenage boy?