Looks like they're giving away some fun stuff, and despite the title it's not Arduino-only so you could easily submit Espruino projects:
http://www.instructables.com/contest/ardĀuinoallthethings/
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Looks like they're giving away some fun stuff, and despite the title it's not Arduino-only so you could easily submit Espruino projects:
http://www.instructables.com/contest/ardĀuinoallthethings/