Here's a running list of free ideas -- if you want to take / expand on any, feel free:
- Reusable flosser with replaceable (disposable) clip-on floss pieces
- Cucumber-carrot sandwiches (Oreo-style)
- A Tinder-style "dating" app for artists to collaborate / form relationships (can display work on profile)
- A customizable little lamp + lampshade necklace you can click on and off