This pair has only black & white Sonic in 2 poses, but the background is done in blue screen-tone (comic book style) dots & checkering. The yellow is a pattern with his name in Japanese, small. The big yellow letters are "Sonic" written vertically in Japanese too.
These are available from New Look in 2010 / 2011. They're actually white, the close up makes it looke yellowed, but that's just the photo.
Photo by HoggerTheHedgehog
Photo by Shadouge