Famous Yuba Blue Boulders are the best used landscaping, waterfalls and ponds. They are naturally smooth from live stream action. Some are extremely smooth and are very people friendly. Yuba Blues are extremely durable and luster increases with exposure to the elements and therefore look even better years after being installed in your project. Natural colors vary from grays to bluish grays to blackish and greenish hues. From a distance most Yuba Blues look bluish; some folks think they look greenish.