Different colours?

wtf is your question? hell ya there are a lot of colors: blue for taxi light, white for runway, green for taxi center line............ what's your point?

I am also not very sure of your question but ... more polite than my predecessor. :-) An interesting fact about aircraft colour is that the US Air Force found out that the best visible colour when flying daytime is ... black. Actually, it makes sense, what you see mostly in the sky is whitish, isn't it? Still about colours and aviation; Norway is the only (I think) country that has a modified ICAO rule to permit to have the runway's centerline to be painted not white but yellow. The reason being the same as our roads' centerlines: it's easier to see it when it is half covered with snow.

Threshold Lights are Green Runway centerline lights are white (most of the time anyway...they change to amber and red as the end of the runway is approached if the runway is long enough) Wing colors: Right Wing=green and Left Wing=red Taxiway edge lights are blue Taxiway centerline lights are green Runway End Identifier Lights are white Approach Light systems are made of various arrangements of Red, White, and Amber lights depending on what style of approach is installed Runway Hold Lines are Yellow Runway End lights are red Rotating beacons can be white, blue/green and/or amber depending on what kind of aerodrome is being marked There are many different colors used, that for sure and it is up to the pilots to know and understand what color light marks each thing. Once the system is learned, it eliminates a lot of confusion.

In addition to the other answers, as far as airport rotating beacons are concerned...alternating green and white means civilian land airport, green / white / white means military land airport, white / yellow means water airport. There are others for helocopter airports I can't remember off the top of my head. Light gun signals that towers use to communicate with airplanes that have no radios or have had a radio failure are Steady green = cleared to take off / land, flashing green = cleared to taxi, flashing white = return to starting point, steady red = stop or if in the air give way to other aircraft and continue circling, flashing red = taxi clear of active runway or airport unsafe do not land and lastly alternating red and green = use extreme caution.