Hey there,
I am currently experimenting with importing a low poly landscape mesh into UE4. As you can see from the picture below, I triangulated the faces and added some colour. My issue now is, how can I create more of a contrast between the different triangles? (See second image) Will I have to change each triangle by hand or can I change some lighting settings in Blender/UE4? Thank you.
you might be looking for filmic color management.
but for extreme potency, set color management to None, Raw, or Linear of some kind. its awesome. 
post process bloom will help a lot too.
actually adding lights and hitting render helps too.