Blue Oak Landscape Boulders Northern California quarry. Blue Oak Landscape Boulders are among the most sought after and unique landscape materials in California. The natural dark brown colors are contrasted with splashes of deep red and green tones. When ordering use the Purchase Order function at checkout and enter ROCK as your payment method. This will allow you to create an order for a firm transportation quote without having to pay for it at this time. While we have posted transport rates, in many circumstances we are able to ship the order to you for less. You will be given a firm cost on the whole order within a few minutes to a few hours.