Graphically nothing spectacular (I think flashy lasers and lots of scene changes don't work well for relaxing ), but this genre of music needs some love, too.
Some of them are a bit older, but maybe they are (in one way or another) inspirational for other chillout-lovers.
As always, best viewed in HD...
Warm colors: https://www.youtube.com/watch?v=d5XC5WHkcI0
Waterfall animation: https://www.youtube.com/watch?v=fDaN6mCeCUk
Audio-controlled sunrise: https://www.youtube.com/watch?v=0-Nepz-vieo