I have four coasters in the Coaster Show at Gallery 30 South in Pasadena, CA! The show officially starts on Sept. 3rd, but you can view the preview show on their site right now! You also have an opportunity to buy the full set right now if you contact the gallery, but only the full set. If you would like to purchase them individually you'll have to wait for the show opening in September.
I based them on the different seasons and the plants that you can find during those times of the year.