Do you remember scratch and sniff stickers growing up? I was shopping at Michael's and saw scented embossing powder. I started googling for reviews and found a forum that mentioned you could make your own scented embossing powder using KoolAid. This made me think of making my daughter Shopkins Scratch and Sniff stickers. I really am impressed at how they turned out. The smell is strong and its been about three weeks and the scent is still strong!
See my youtube tutorial here on how to make your own Shopkins (or any image) scratch and sniff stickers: https://www.youtube.com/watch?v=nC3jjgUvC58