Unity editor is looking different after installing Unity 5.4.0. I have attached a screenshot
As you can see anything which is selected it is showing in orange color. Skybox is orange.
The texture which is shown in the image is red in original but in unity it is showing as blue. This is weird. Materials, Folders all are highlighted orange.
That’s really quite odd. All of your colors (except for the ones for the unity skin itself) are inverted. I haven’t seen anything like this reported before and I’m not really sure what would cause something like that. I find it really interesting that the skin itself isn’t inverted.