This pair of kids-size socks (still, check if they fit your feet! Socks can be somewhat versatile) is found at ASDA, and is part of a 2 pair for 3 pound deal. (see other pair next-to) With a bargain like this, picking up a couple pairs should be done.

The design here is quite large, with Sonic taking up the whole sock and wrapping around it. This gives it an interesting look, and maintains his detail.