I use olive, white, black and whatever other random color or commotion of colors I have on hand. They catch all the trout species, and all the bass species, I haven’t found a particular color that outshines the rest. One I really like though is a light brown top with a cream bottom, very natural and a fantastic fish catcher. Cream is just an off white color, basically what we would call “bone” I like it better than straight up bright white in a lot of cases. Nimrods tackle on eBay has great prices on marabou.