I worked on a big part of the kelp forest biome including the rocks, most plants, ground textures (minus the sand), and exterior lighting for all times of day. Tina Wang contributed the skybox and the original concept for this biome came from Gabe Gonzalez. I had a good time walking along the beach at Laguna, snapping pics of washed up kelp to use as reference. The giant kelp trees in particular come from the bull kelp that's so common around there.