The universe is very big and there are many solar systems that will most likely have live and some will have complex live. Where ever the conditions are right primitive live will start to evolve such primitive live can evolve in to complex live suited to the environment of the planet on which they evolve. The colour of an alien will therefore depend on environmental factors of the given planet and its star. On earth the colour of human skin depends on the amount of UV radiation that we are exposed to this is why people from Iceland have different skin colour to someone from Africa.
GREEN
PURPIL is the VERY RAREST colour of grossman aliens
They dont have hair.
Green usually but they can be any color
The 2009 animated film 'Monsters vs. Aliens' is in colour .
little aliens
Green usually but they can be any color
A deep parywinkle
aliens are said to be green,and big/small,but there still might be other colors.
no, the closest thing to aliens in the sims 3 is making your sims green or any other color.
Well, They were a glowing Neon Burgendee color. I myself HAVE seen aliens in AREA 51.5.
Scientists have not seen an alien, so there is no proof of which color they are.