These are little window clings. They're a cute & subtle way to help advertise Wreck it Ralph. These were given out to certain movie theaters for the opening of the film. You can see little Sonic 1 or 2 style
pixel Sonic & little laughing pixel Eggman. These didn't get in the "store display" category, as they were likely used outside the USA as well as within it. 

What role did Sonic actually play in Wreck it Ralph?
He had a few appearances, but his main one was a PSA=public service announcement on a kiosk style ad-board in an area where all game characters can go. He reminds anyone listening that if they die outside their game, they can't regenerate/that death is permenent. (so be careful) You can also spot him in the background talking to a turtle character in a different scene, he's hit by an escape pod (and loses his rings) in another, there are also pictures of Tails, Knuckles & Eggman (spy one in the Hero's Duty game part), and he appears in chemical plant zone during the credits, fighting Eggman / losing rings. Eggman appears at the "BadGuys meeting", but doesn't say anything/contribute. However, he does help recite the oath/theme of the group. Sonic is voiced by Roger Craig Smith. Additional info added by Banana