Just some parametric and printable key rings modeled in openSCAD.org
The trinket is my way of wishing makerbot happy holidays and it was printed before our extruder ran into some trouble a few days ago. I've also modeled icons for other projects I got to know and love (miniature reprap mendel, thingiverse's gear logo, openMaterials logo), and I'm just waiting to be able to print them before uploading those files.
Simply pick the pieces you want and print them or enter your own specifications in the keyRing.scad file to create custom versions. The script includes parameters for diameter, depth, thickness, slit width, and optional second ring.