Based on the Muir tartan, the California tartan was officially adopted in July of 2001. The tartan’s blue background reflects the sky, the Pacific Ocean, and the state’s many rivers and mountains. The green reflects the forests of the Sierras, and the many fields, forests, and parks. The red, gold, and blue signify the arts, sciences, and industry of the people of the State of California. Click here to see all of the kilts and here for all the accessories you can get in the California State Tartan. Eureka!