The Nintendo 3DS version of Sonic & All-Stars Racing Transformed, there are a set of unused mugshots:

• Ryo Hazuki, who was in the first Sonic & Sega All-Stars Racing and was available as PC-exclusive DLC for Transformed
• Billy Hatcher, who was in the first Sonic & Sega All-Stars Racing
• Classic Sonic
• An Xbox 360 Avatar
• Sackboy from LittleBigPlanet, implying that may be have been planned as a PS3-exclusive character at some point.
• A soccer ball with "temp" written above it, possibly either a placeholder or related to the Football Manager character who would appear as DLC in the PC version.