I printed the logo for the Appalachian Mountain Bike Club.
Scale this thing up to 109% to make it the size of a real 102mm chainring, or scale it down to make it into an accessory that you can pin to your bike jersey.

This thing was made with Tinkercad. The AMBC letters are slightly higher than the chainring outline so you can use a filament swap to make the letters a different color than the chainring and background.