Reader Noah Baird writes in with a 5-Minute Project idea: the guitar cord holder (though it could work with any cord).
2 Tic Tac containers
1: Duct tape the Tic Tac containers to each other.
2: Wind the guitar cord around them.
Increase the number of containers with the length of the cord.
I suspect you could substitue lots of things for the Tic Tac containers (the Altoids cord holder?).