1.) Mobs don't render appropriately when they stand on colored light. Cows come in odd colors, and this appears to be a repeat (but not identical to) issue 6 So, we'll have to look into how they're rendered, and what they're doing to the lighting component they recieve from world.

It looks like the only remaining issue on this would be the glowing-eye overlay that spiders and endermen have. Currently... when they are lit on fire, the fire appears green.

Color and overlays appear to be rendering properly. Now we have an intermittent issue where the entire mob appears to flash white near or at the edge of a colored light... Possibly another issue where the lightmap is not enabled/disabled properly.