Purple Textured Silicone Grip Case for Apple iPod Touch 4, 4G (4th Generation) - Includes 24/7 Cases Microfiber Cleaning Cloth [Retail Packaging by DandyCase]
We bought the purple cover and a green cover at the same time.  The purple cover does a great job protectig, but you can not get the buttons and such to work as the inserts for buttons do not line up.  A bit dissapointing.