Build a unicorn robot that makes its own art! A kit with the electronic parts for this project is available here: https://www.homesciencetools.com/product/bristlebot-robots-kit/. Written instructions to build an Art Bot are available on the Science Buddies website: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Robotics_p014/robotics/build-art-bot

The kit also includes parts to make a bristlebot: https://youtu.be/Q1zToREgV0c and a brushbot: https://youtu.be/S3GAL2MshCw