A party-favor item of some kind is generally included among a release, and 2017 is no exception with this sheet of temporary tattoos.
There are 8 designs per sheet. You get Tails' face with his name, running Sonic, Sonic in a 'flame' ring, a slogan "Come on step it up!", Sonic & Amy in a star, Sonic portrait, just him jumping & STK-trio.
Why Amy appears in the tattoos but nowhere else is as much a mystery as to why they skipped Shadow & used him on a bunch of the other decorations.

This decor set somehow also included a plastic re-use-able Sonic drink cup, but it's not really a party-good nor particularly a common favor, so it got onto USA Homegoods. It shares the slogan with one of the tattoos here.