It's in the corners; it's more 'random shades that aren't used anywhere else, despite the fact that they sure look like the other shades. I gave up, and started to reuse colours after a while. =P
Something that should eventually be done, is to figure out the full pallet for a particular card's colour, and map it out, so that it's easier to recolour it and such. =P I tried that, but, well, I didn't expect those random shades. =P