I think I've also cracked the grass situation, using terrain patches (a blobby patch of grass texture created as a symbol for each of the 10 grass textures). The full grass textures are also available, but I like the more natural looking terrain patches better, so this map only has grass as symbols.

I've made a new problem for myself, though. I now need to make a few subtle pebble cluster and dead leaf patches for the dirt because it looks too plain.

I think I've got the dirt textures and some of the trees sorted out now. There's a lot more stuff in the pipeline, but I'm on my way to bed right now, so this is a shot of my screen as I close everything down.

That looks fine to me :)

That looks better :)

This is colour 60 on my own map.

The simplest way is probably to add a Wall Shadow, Point Light Finalize sheet effect to one of the last sheets in the list, check the Shadow Color is ambient light box and pick a nice bluish colour. That way you can turn the effect on and off.