I thought it was maybe an old video thing but I have an new machine now and it's still there.  Been around as far as I can remember from WoM.

There is a blue ambient light that appears on everything in the 'paperdoll' window.  I can't tell if it's supposed to be a shadow or what.  It appears to come from the right, behind the character.

The most striking effect is on a sword, no matter the color of metal it will appear to be dyed blue. 

Just want to know if this is known or unusually unique, since I can find no discussion of it.

Edit: I guess it appears to be the 'natural' ambient light, so it might not have a source location but just appear to be the rear right since the main light is from the front left.