How to color individual polygons in a low poly model?

Question

So I have been working on this low poly project and have most of the modeling done. So, I have begun texturing and ran into a problem. I can't figure out how to color each individual polygon of my model. Here let me explain.

Notice how this image(that I found in a google search) has polygons in the model and it transition from blue to red and even in the blue and red the saturation and brightness changes to achieve a more natural look. Now I understand this effect can be achieved with lighting, but I'm doing a landscape so one solid color will not look good. I'm looking for natural variations in color and can't figure how to color them individually.

Do you want to achieve the same effect like in this question ? — Mr Zak, Mar 20 '16 at 20:00
Then I think you have possibility to get desired result using ways from 2 answers in the linked thread - either by code provided or extruding and deleting original geometry (to detach faces from each other). Just don't remove doubles if using 2-nd way. — Mr Zak, Mar 20 '16 at 22:12

score 3 · Accepted Answer · answered Mar 20 '16 at 21:45

That looks like it was done using vertex colors.

Go into Vertex Paint mode and apply your colors. Note that faces will blend colors in a gradient based on their vertices' colors.

Then, in your Blender Render material, select the Vertex Color Paint option.

How to color individual polygons in a low poly model?

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