If you happen to do a spectral analysis of all the stars in the observable universe, you can see what colour the universe is.

Apparently this is the average colour of the universe:

Cosmic Latte
Cosmic Latte

What’s interesting to note is that the colour changes the older the universe gets, from blue til red. Cosmic Latte is made up of stars that are 5 billion years old, so the colour will become redder as time goes on, so technically Cosmic Latte is a colour that changes colour.

{You can read more about here.}