Boilerplate
Raph and Boud's boilerplate for gamejams.
Random Concepts
RTS
2D sidescroller RTS (like those old flash games) where the player has to send commands in morse code to send out troups.
The player has morse code reference on their table and their morse code emitter. They can look up with binoculars to look at the state of the battle and turn back to their table to react accordingly.
Clicker
Buttons, chips and stuff on a PCB. You have to click, manage energy and use cash to upgrade your board with more buttons, chips, mechanical clickers, batteries and cats.