Check out this list of design challenges if you are looking for a Makey-Makey project to challenge yourself with:
Create a Game Show in Scratch and use the Makey Makey connected to cardboard and buzzers!
Create a custom game controller for a Scratch game.
Create an interactive exit ticket or survey system.
Example Data Tracker on Instructables Making your own exit tracker, data tracker, or voting machine.Create a poster that is interactive! To get started, choose ONE UNIT from one of your subjects from this year or last year. For example, your poster might focus on highlighting the key ideas from the "Heat and Temperature Unit" in grade 7 science!
Interactive Science ExhibitCreate an interactive model to teach others about your chosen topic. You might make an interactive CELL MODEL or an interactive model of a BODY SYSTEM.
Useful Links
(makerbus.blog)
(makemakeyk12)
(hackster.io)