Boundary layer would be an interesting part to see visualized.
You could make it premium, label it experimental and stash it in some weird container where it can live even if it was buggy or otherwise non perfect, and subject to change or removal later on.
Then it'd be a matter of defining a scale and creating & serving tiles for a specific parameter of a model right? You could also add more parameters for experimentation without perhaps committing to them fully. Might even generate the tiles runtime, even if that was slower, just to make it easier to experiment with parameters and see what would finally make it's way to the actual list of layers