Don't throw away that dead or tangled coat hanger! It could make a nifty headphone storage hook.
As hacks go, this is as simple as they come. It's from the mad geniuses at IKEAhackers, which means it's using an IKEA coat hanger, but any reasonably thick coat hanger could simply be cut and affixed for this purpose.
Quick IKEA coathanger headphone holder [IKEAHackers]