Do what you like with them, if you got nowhere to stick them on, then may as well throw them away in the bin.
As some of the other members have already suggested, do whatever you want with them, give them to your kids if you have any, stick them on your Dell computer or whatever non-Apple computer you have, stick them on your car and brag you're an Apple user. Stick them on your books, bags, on the back of your iPad if you want a bigger logo than the one already on the iPad, stick them on your bedroom door.
It's up to you.
I haven't used mine, just left them in the box.