I agree that background color is very helpful within a nested node group. It's a quicker visual aid than having to reference the bread crumbs. I didn't even realize the background was getting brighter deeper levels in because it's so subtle right now. I really like the idea of brightening per level, but it would be enhanced by being able to control the amount per, and especially by adding color/tint.

Thank you!

Sorry about that Alaska - I must've unchecked it while reducing the file. This one should work.