Creating complex patterns is easier if you layout all your plans with a pencil. To do this, first prep the surface to be tiled by skimming the entire area with a layer of white thinset (mastic won't work) and let it dry. Now you have the perfect surface to write on, as well as the ideal surface to accept the installation thinset or mastic (either work for the second layer) that you will use to set the tiles.
A pattern similar to the one shown here using a mix of glass styles from Voguebay can be achieved with some advanced planning. They come in 12-inch-square interlocking sheets. About $56 per square foot; Voguebay