I've been experimented with the sewing machine recently and made myself a case for my headphones and my ipod.  I wanted something that attaches to the inside of my bag so that I worry less about losing it so here's what I came up with.

The first bit is a simple ipod case with a button at the top to keep it secure.  The second bit is a zip up headphone case.  My headphones are ones that go round your ears so it meant it had to be quite big.  I've attached the two parts together and fitted a keyring attachment so I can hook it to one of the zips on the inside of my bag.  I'm very happy with how it came out :)