One of the things I always do to a scene is use some sort of color grading.
Here is a scene that I have only changed the color grading on. You will see what a massive difference each LUT can make.
Here is the scene with absolutely no post processing whatsoever
Now here is the scene with post processing added (FXAA, Bloom, and Ambient Occlusion) all from this Unity package
Now let’s take the lighting down, but not add any color correction yet
Now with some desert color grading
And now with some warm color grading
And finally with some weird blue diffuse thing
FYI I didn’t make up the names of those color gradings – those are the names of the LUTs in the Amplify LUT pack
Depending upon which type of feel you are trying to get for your game, color grading can make a massive difference. For indie game developers, color grading is a quick and inexpensive (draw call and cost wise) way to improve the look of your game