I just created this like 20 minutes ago. After I got renders of the Demon Sonic characters kiguri made I wanted to make a really badass background out of Shadow and Sonic.
I did just that after I finished making a sig for a contest I'm entering it in.
Created in Photoshop CS3 Extended. The main background is clouds with rain, and the other two backgrounds are custom made to match both Sonic and Shadow.
Sonic the Hedgehog and Shadow the Hedgehog (c) Sega and Sonic Team.
Demon Sonic and Demon Shadow (c) kiguri