Ah, the memories, I think this is where my love of colored pens comes from. Just thing of the color options of gel pens!!! This toy is well used, with some of the gears permanently ink stained from frequent use. It was fun to try out those well worn holes and remember sitting at the kitchen table for hours making tons of these things in red,blue, green and black.
I'm thinking a bracelet with shrinky dink Spirograph charms would be the perfect project or maybe just some simple note cards. If you have any good ideas, let me know, I'm not going to be satisfied until it wear the teeth off the gears.