It's super easy, just download the color mod of your choice and install it in the game's data folder. I'll show you an example:
View attachment 2228545
In the end it would be copy and replace,
Sorry that the image is in Spanish, I speak Spanish and my operating system is in my native language.
PSD: wow that's crazy we already have 400+ images in my mod... how time flies.
Regarding the downloads, the main page of this post there is a hyperlink that takes you to a colored version of the entire night scene and in my signature you will find another link. I think you can use both to have more colored images although you will find inconsistencies with the colors.