its hard to think that colors could change mood in your cham but chameleons are the most visually reliant out of all animals and they communicate through visual cues conveyed by color changes and of course posture. so it could be possible that certain colors bother certain species of chameleon, Jacksons turn black twhen stressed, so black is a visual cue of stress to them. to a panther the color distinction would obviously be a lot different.. im just sayin