Make a specialised marketplace for collectibles you are interested in
Gamify exercise
An app that helps you save money on your groceries
Chain reaction machine
Gyroscopic mouse pointer
Doodle Jump, Angry Birds or Flappy Bird with a twist
Tool to raise awareness and engagement of social movements
Interactive map and story of historic migrations
Make the most incredible button
Make an opponent to practice against
Musical gloves
Make a local guide of your town or city's best _____s
Make a toy vehicle
Make a font
Interactive visualiser for data flow (think Github Globe)
P2P web application for sharing things
Augmented cutlery
Make a game based on a movie scene
Wizard’s Chess
Pinball, but with unconventional materials
Make an actual helicopter hat
Translate movement into music or art
What if a lazy susan moved instead of spun?
A chair that alerts you if you've sat down for too long
The environment moves the players (or the players move the environment)
Battle bots; battle it out during a show and tell
Training game to make the perfect coffee
Make Owen a hat to keep his head warm in winter
Make a dot-to-dot image generator for kids
Make a habit/goal tracker
Make a "what's on" app for your town or city, like Timeout London
Model car that moves in mysterious ways
The best routes for skating, managed by the community
Make the world easier to navigate for people with physical limitations