I found some wood grips I've never seen before. They come in walnut, black walnut, or rosewood. Pricey but look very high quality. The black walnut is very dark and that's what I want to eventually get for my K40.
https://www.ksdgripsusa.com/product/kahr
The only picture they have for the Kahr is the walnut, but you can find pictures of the other woods on their website.