A rope bracelet - reminds me of making friendship bracelets back in the day. My right second toe used to go numb because I'd hook the end of the bracelet over it, and then knot embroidery floss for HOURS.
I'm going to make these in a less-feminine version so my hubby is comfortable using it. When a road trip occurs, we will fill it with an accurate amount of change for tolls. This way, we don't have to go diggin' for change (like we normally do!