I was just doing some wordbuilding test in the CK, making a small area of a new worldspace, texturing the ground and putting pine trees in to make a dark forest. I have used Pineforest02 as my only grass producing texture, and I was thinking "This is actually nice and dark, quite good for what I want". Then I try to put down a tree and bam, the grass all suddenly becomes bright. Why is this happening? Will the changes show up in game? If not, which version will show up in game, light or dark? The texture itself does not change at all, only the grass meshes sticking up out of it. It also only happens when I put down something from the "trees" category. Statics such as architecture have no effect.

Another thing, is there no texture for just a cobbled path in Skyrim?