I ordered a Pebble Time through their Kickstarter project earlier this year. I was trying to think of a neat project I could build using the accelerometer, and then I thought I could use it to control a robot. I went to RobotsConf last year, and received a SumoBot kit. It included a wooden chassis, wheels, servos and a battery pack to power the robot. I then added Particle's Spark Core WiFi based controller.
All pebble's come with a builtin accelerometer that you can use to recognize taps and G forces around the x, y and z axis of the watch. I then went about writing code I could use on the Spark Core, Pebble and an Azure website to control the robot.
I then created an Node.js application to accept those web requests. I could have just used the Particle cloud to handle these requests, but I added a front end to the Node.js application so I could use WebSockets through Socket.io to debug my Pebble App.
The last step was to write firmware for my Spark Core that used their Cloud API to call a function for controlling the servos on the Sumobot.