So you are tired of traditional Christmas trees and want to build a more colorful version? You could always try this NeoPixel Xmas Tree project. The developer used a 50x40cm transparent film, a 1-meter WS2812B LED band, and a few other parts to complete the project. Example code has been made available on Instructables.
The above video shows what the NeoPixel Xmas Tree looks like. Yet another simple project for Arduino students.