Hi everybody!
I've developed a a CSS3 inspired, keyframe based rgb light animation library for controlling RGB leds with Arduino.
It basically allows you to program custom RGB light patterns by specifying a duration and what color to display in a specific percentage of that duration, without caring about transitions between the colors. I've put a small demo video here Arduino Light Animation on Vimeo and the library comes with quite a lot of examples.
I'd love to hear any suggestion and comments about it!
Didn't actually do it for christmas... but I guess it can come in handy these days 
It's here on github GitHub - fabricacode/arduinoLightAnimation: CSS3 style color animation library for controlling RGB leds on Arduino
Cheers!