This is a good site because on the home page it showcases a wide variety of textures so that the visitors are given an idea of what type of products they have to choose from. They have 2 navigations: one at the top which includes about, textures, tutorials, and members. The second is on the right which lists all the different categories of textures they have. I think this a good way to separate the navigation and keep like items together.
Although the design of the site isn't great, it's still a good site and does just enough to keep visitors in their site browsing.