Hive Fleet Behemoth have a combination blood red/ blue colour scheme with black weapons.
You can paint any models how you like, however they are normally painted in blues and could look good in tortoise.
french tip
Yes, fiberglass doors can be painted to change their color or appearance.
Eldar are supposed to be a colorful army, whos color scheme is based on the type of unit. Go look through some images of how the Heavy Metal team (GW employees) paints them. Also if you look in the back of your codex there are like 10 pages on examples of painted models.
He painted the hotel an eye catching color
What colour should a basketball hoop be painted?
The painted lady butterfly eggs are pale green
No, you will have to have it painted in a different color.
No, but it always looks a lot better if your army is matching, and your opponent with appreciate it.
Black.
Pink
Repaint it with the original color.