Play a good MMO(not WOW!) For a few months. Or if you don't like those I would just get a... well I don't know, I still have 100$ or so left over from Christmas, but I'm saving that for this one game I really want that isn't out yet.
If you want a good game to try, check out Fire Emblem the Sacred Stones. That is one of my favorite GBA games.
Go out and find something that just catches your eye, maybe something you normally wouldn't buy. Or, maybe try something you normally wouldn't, you'd be surprised some of the things you could get for about $100.
Lol. I guess your guaranteed at least one response from a representative telling you to donate. (No offence to you NoName, that just made me crack up. XD) Anyway, do the math. $100 in the bank with .05% interest rate = $105 in exactly one year. More money in the bank = more money in the future. You know, for when you know what you want to spend it on.
So, if that interest rate never changed...it would take quite a while to accumulate a lot of money unless you deposit some and continue saving for the future.
Yeah, one year for 5 dollars isn't a good inversion. But it all depends on what you like. If you like games go to a gaming site like IGN and look for the best rated in your favorite genre. If you like music, it's a little harder, but it's basically the same.
If you like other things, you could always save for an Ipod, a PSP/DS. I would probably buy clothes and other stuff like that.
