That looks *really* nice, i want to do a more extreme Green colour in my my95 wrx... i guess it's the same sort of principle really :P

for green you got it easy

just get some green LEDs that plug straight in and you're laughing

note i will be ordering some more of the good quality wide beam ones from the states soon that are direct plug and play so i will be posting a group buy for them soon price will be in the $3 per bulb territory depending on exchange rate and shipping.