The background grass tiles in the forest look too similar to the foreground's

[Dragonick-T-Hedgewing]

The background tiles in some of the Forest stages have grass on them that looks too similar to that in the foreground. This sometimes throws me off; whilst I've gotten sort of used to it, I've missed some jumps or fallen into the water because of it.

They aren't identical, but they're similar enough to fool a quick or distracted player, and they sort of look wrong with how dark the rest of the background tiles are in comparison.

[Rusty-Box]

This will be changed with the new tileset overhaul #2136
Background walls with grassy tops will be unisolid going forward.