I see in a lot of WIP-images people rendering their models untextured, but with a nice looking light. It's like there is a multicolored spectrum in the shadows. How do they achieve this? I see it in almost everyones "clay renders" (or how you call it). When I just render my model with a standard light source everything is completely monochrome.
The only way for me to achieve something like this is to add a 360-image as world background and set the light and image details to reflect in the model. I don't think this is how they do it.
Here is a couple of example on what I mean: