I am using a fun "trick" with mods. I made all of my backgrounds (including the overhanging tree, cliff, and houses) less colored....more gray.

It makes the mushrooms and collectibles really POP out! It also makes it easier to find the villagers when I want them.

I may post them to download, but it is a lot of files. Probably easier for people to make the change themselves. The main map backgrounds are .jpg files, so even opening them in Paint and converting them to Black & White/Greyscale would have about the same effect.