[devilsknite1]

Well what I meant by separate sprites is have different color image parts for each, which is what I think Stefan was suggesting essentially. That way the player could choose a color, and you would just have to edit the gani via script to replace the red sprite for the door with the blue sprite for the door. Unless you want a variety of different shades of r/g/b, having a graphics person make a few different shades of each color may be a plausible method.

Other than that, Jer's is probably the best method. I was typing that you could just set an overlay attribute to the NPC, but I'm not so sure how well that would work as it's the animation itself you're wanting to edit.