Sonic and Rainbow DashAmy and Pinkie PieRouge and RarityBlaze and Twilight Sparkle
Cream and FluttershyKnuckles and ApplejackBig and Derpy
(Bonus) Sonic and Twilight
(Bonus) Tails and Twilight
UPDATE: Wallpaper has been upgraded with new models, quotes, and background color.
2012 Version: [link]
I'm sure 2Snacks wouldn't mind about this. :I
Sonic X Equestria logo created by me.
Cream model created by Sega
Fluttershy model created by 2Snacks