Get Colorizers to work right

[da3dsoul]

Grass in particular. You seem to know a bit more about rendering than I do. I started it, though.
extension of #73

[planetguy32]

I looked into grass's rendering and it looks like there's no easy way to just get the tinted icon, and the method doesn't seem to be side-sensitive. I would hate to hold up the release on this, because it seems like it could be a major time sink.