I donate excess ones to my son's school.I have a bunch pulled now that will go into his class. Before that, I gave them to friends or took them to crops and handed them out.
I have a drawer full of stickers. I pick out the ones I might use depending on the type of layout I'm doing (for example, if I know I'm doing a bunch of fall layouts, I pull all my fall stickers, if I'm doing Christmas, they all come out). Then, I repurposed an old multi-skirt hanger (has three levels and a couple of built-in clips) and attach the stickers to that for a homemade clip-it-up without much muss or fuss. I then just put the hanger around the corner of a shelf in my scrap room.