How about a retro to your Samsung Galaxy S2 (i9100)? That's what promises this silicone case in cassette tape format.
Nothing like coming back to the Decade of 80! Anyone remembers what it was like to rewind this tape legal using a bic pen? The sound sucked but we had fun.
But back to the product, the cover is made of silicone and fits perfectly to the Galaxy S2. At least that's what it says on the site, Since I don't have this phone. Bought to see fit on my Zopo ZP-500. Was too big! From what I understand, There's an opening for each button or S2 connector, In addition to the camera.
I bought also a silicone case similar to this for the iPhone 4. Not here yet, but I do hope this fits better in Zopo.
There are a number of silicone skins for iPhone or the Samsung Galaxy. There are some imitating calculator, Gameboy and also other types and colors of tape.
For those who want to buy, the links to the covers of the Samsung S2, S3 and iphone are down there: