Oh man, was I a sticker fiend when I was younger... I used to have these food-scented scratch-and-sniff stickers that my dad gave me. They were really old, like from the 70s or something. He had just never used them, so he gave them to me. I put them in a book, but the smells are long gone. I also collected the puffy (plastic-ky) stickers, fuzzy ones, ones with googly eyes...you name it, I had it!