Quote from Skotty on February 21, 2013, 1:37 pm

Of course you can!
OnTrigger lightname SetPattern patternhere

Changing the light is more "difficult". You would need to place 3 lights in all colours (means 255 0 0, 0 255 0 and 0 0 255) and you will need to control their brightness via pattern to create all colours you want out of the three basic ones.