Gonna try spriting

[Garamonde]

To decrease the saturation, just make your colors (mainly the purple) more gray-shaded (drag the color picking thing more towards the gray area), but make sure not to go too gray. Playing around with colors to get better, more balanced results is the best thing. You also need to play with hue-shifting, if you saw it in the spriting dictionary, since shadows are never just a darker version of the base color. There are often reddish, bluish, even greenish tones mixed in. Just experiment and you'll start to develop better color choices. Researching color theory might also be a good idea. I think someone posted a graph about that somewhere but I don't know where.