Well, to be fair, his hat was green on the KQ2 box... But he also had a rather swarthy complexion too!
...and the only other time it was done in green intentionally was on the King's Quest Companion 2nd Edition cover (he had blue on the first edition cover btw);
Of course on the Amiga KQ6 (which had color limitations);
Course how about a black hat?
Or a white with purple?
Hey, Graham can look stylish in any color?
And that was only because of texture colour limitations.
Ya, this this may be true.
A little explanation is needed, based what Mark Seibert has said. Basically each area in the game has a limited color pallete. There are basically two sets of color palletes going on, the one used for the game world, and the one used for character models (Connor may or may not have his own pallete as well thus why he can change into various armor types in every world). Basically this is why Daventry is made up of alot grey, dark, greens, blues and some browns.
Barrens is made up of alot reds, oranges, yellows, and browns, etc.
Frozen reaches lots of shades of blue, white, grey, etc.
However, I'm not entirely sure this excuse works for Graham's mugshot! Because in the same room of the castle, and other locations are clearly textures that have blue in them. Blue in several shades that would have worked for Graham's hat. I'll get you screenshots of the examples later. Which makes me think they actually knowingly chose to 'tweek his colors' intentionally. It's also not a straight color 'reverse' (white becomes black, other colors turn into other colors, etc), because his shirt or face complexion didn't change!
On the other hand, I suppose maybe the two pictures (both Graham and Valanice) may have been put on the character model pallete instead of the level color pallete (Graham after all is a moveable/animated feature, as the painting is on a wall that can be moved)... Perhaps the character model pallete had its own limitations in that that particular level (but not sure why as there aren't that many animated character models in Daventry) I'm not sure the stone characters count as 'character models', unless designers intentionally chose to use the separate character model pallete for them (in the Kingdom of Daventry level, at least the Wizard, who is half stone, would have used the character pallete)...