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