I made an iPod case three or four years ago that I still use ALL the time. I didn't use a pattern because was easy enough to crochet a rectangle and sew the edges together and, of course, the button closure is an iPod button, sooo not in proportion though. I sort of wish I had made the case big enough to leave the ear buds attached and be able to fit it all into the case but that's tight squeeze so I crocheted a white rectangle and sewed that to one side and made a drawstring with the yarn to hold that closed. I have to say, like that feature more than I used to. I made a second, identical case that I gave to a friend for Christmas and she still uses hers to!
After a few years of use it's a little dirty from sitting in the bottom of my purse a lot, but my iPod is still scratch free and I don't even use a screen protector. The case is starting to show it's wear with little frayed and fuzzy ends of yarn sticking out. Maybe I'll get around to making a new one one of these days. :)