Using 60 LED's facing a suitable wall, the time is projected in colour.
Automated railroad level crossing detects the train approaching the level crossing and alerts the users and closes the gate.
Control and query your garage door with IFTTT.
This is a simple use case of combining the Amazon Echo (Alexa) and Spark Core.
Spark Core + Camera + NodeJS = Home Security Camera
Robotic arm controlled over the internet to perform pick and place operation.
An ambient soundtrack that reflects status and events in your physical and virtual world
Get your essential appliances off the grid with just one solar panel
Using the Spark Core to gather plant/garden environment data then post it for storage and visualization it to a custom cloud application.