This small clip holds Sharpie pens of several types and provides a nice hanger-hole for any sort of peg, nail, hook, etc. The Sharpie pen is held by friction of the clip, so smaller pens might require a layer or two of clear tape to fit properly.

I printed this in ASA, but it could be printed in any rigid plastic, preferably one that is heat resistant so that the clip does not spread out over time in a hot garage. The Blender source is included so that the hanger clip can be modified to suit smaller or larger pens. In the Blender model, the friction-ring is a separate object from the clip body, so the ring can be shrunk slightly to more firmly grip smaller pens, with the small chance that the clip will crack when a larger pen is installed.

Enjoy, remix, modify, and have fun!