These stickers are for the cover of your Mac and make use of the lighted apple. The stickers were created by a couple of guys from Munich. One sunny day in a Biergarten they were together with some other people for a meeting. They all had their Mac’s with them and after several hours and moving around and getting distracted with presumably Beer, they couldn’t quickly tell whose was whose. In the end, two people took the wrong laptop home… and so they created these stickers.
9 Euros or about $12 including free shipping via their website at klebra.com