We've been stocking some options in conductive copper foil and nylon tape recently, but sometimes a project needs material that's more analog.

Enter this nice chunky spool of Rainbow Crafting Yarn! You can use this material to decorate your robot, or of course as a colorful twin in guides such as the Crickit Mini Golf Course or the Carnival Swing Ride

Yarn is made of cotton, you could use it for knitting too!