I spent a number of childhood summers at Toyon Bay on Catalina Island, and in Catalina's biggest (almost only) town of Avalon first saw the colorful tile that was made there at the beginning of this century. I was back in Avalon a little over a week ago and was able to get pictures of a few examples of Catalina tile, most of which are up in the Hewn & Hammered Flickr group.
Even though the Catalina Tile Co. stopped making tile many years ago, a number of talented artists are making both faithful reproductions of hand-glazed Catalina tile and designs (including some pretty amazing murals) based on the Catalina style.
I've seen more and more Catalina tile in private collections and at museums recently - I guess folks are dusting off pieces that their parents and grandparents picked up on weekend vacations earlier in the century. A few books on the subject - both general histories and collecting guides - are available.