Purple Penguin Silicone Soft Case Cover for IPOD TOUCH 4 4G 4TH GENERATION (ITOUCH 4) + Free WirelessGeeks247 Detachable Neck Strap / Lanyard
My son uses this on his ipod.  Looks cute but it has worn a little spot on the corner of his ipod, not sure why.  Looks like some sort of chemical reaction.