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.