I´ve had some stainlees steel tubes 20x30mm as scrap parts left, so we decided to build a tree out of it. It´s approx. 3m tall and 2,5m in diameter. Everything looks better with some sparkling rgb leds! A teensy running the fastled library is handling all the work. approx 750 leds are fastened to the tree. A Bluetooth app allows me to control the effects. Big thx go out to the fastled community on Google+ Paul Stoffregen for the Teensy funkboxing.com for the bluetooth code http://funkboxing.com/wordpress/?p=2154 Danny Wilson for the bouncing balls library https://github.com/fibonacci162 and hackaday.io for this great project pages. if i forgot someone plz excuse me