Edible stickers for cakes

If you have the image you can probably take it to your local supermarket and ask them for an edible image. My grocery store (ShopRite) will print them for me for $10 a sheet.
Sweetwise also just started selling printable frosting sheets (http://sweetwise.com/edibles/edible-decorations/frosting-sheets.html). neither of these will stick to fondant on their own. You will have to use edible glue to get it to stick.