So, I plan to teach to the Stony Brook University campus (where I work) a few bicycle flat tire repair clinics. It will be hands on therefore limited to 6-8 participants. The purpose is to help faculty/staff/students learn to repair a flat on the roadside.

I'm working with the campus on this, and I will probably offer 2-4 classes at different times of day/week to try to be accommodate those with different schedules.

This is my first time doing this so I’ll probably suck at it. However, I decided to give participants a small gift. What better way to recycle my old chains instead of just throwing them out?

If they are a hit, maybe I'll keep making them (I have several more old chains sitting around) and maybe offer them for sale with any proceeds going to some kind of event/charity?

They look good.  I've got one for my spare key.
Don't forget the ever popular inner tube coaster.  Also, doormats when you've got enough.

What did you use to create those loops? 

Photo is for inspiration only!
The most experience I have with old inner tubes is on bike handlebars, and tying them together to make exercise stretch loops.
I've seen various pictures of people weaving coasters, door mats, earrings of all things, but admittedly have never tried it.  
Really looking forward to seeing what you can do!

Hmm... Not sure that might be beyond my skill.. lol..