These tiles came from the same "rescue" as the floral trim tiles I've posted earlier. In addition to amazing decorative tiles Malibu Potteries (1926 - 1932) produced a number of solid tiles in all kinds of shapes. The Potteries targeted builders and architects, and I believe most of the tiles I have are meant to be bathroom tiles. The glaze colors (blue, turquoise, jade) and quality (matte and glossy) are what makes these stand out.
There are also a few really nice blue pillow tiles in two different sizes that are documented on page 66 of the California Tile, The Golden Era 1910-1940 (vol. 2).
Malibu Potteries (1926 - 1932) produced a huge variety of tiles during its short history. Rufus Keeler who ran Malibu Potteries was very keen on highest quality products and was a fan of experimenting with glazes. Malibu produced a couple of catalogs that were aimed at builders and architects.
This collection of trim tiles was a "rescue" from Malibu fires of 1978. As a matter of fact, these tiles might have survived two fires - the original one in 1932 that destroyed the factory and then the Agoura-Malibu firestorm of 1978. The second fire destroyed whatever was left of the old factory, and tiles were scattered around for many years, sometimes washing up the beach.