I managed to come up with another rainbow of reading in 2015 in my own Color Coded Reading Challenge. It has pretty simple rules--read nine books that feature the following colors either in the title or on the cover. Here are the books I included in this year's palette.
1. A book with "Blue" or any shade of Blue (Turquoise, Aquamarine, Navy, etc) in the title/on the cover.
The Turquoise Shop by Frances Crane (7/2/15)
The Red Box by Rex Stout (10/3/15)
Poison Jasmine by Clyde B. Clason (4/5/15)
The Golden Age of Murder by Martin Edwards (5/5/15)
The Avenging Parrot by Anne Austin [cover is completely green] (8/4/15)
The Case of the Borrowed Brunette by Erle Stanley Gardner (7/6/15)
Asimov's Choice: Black Holes & Bug-Eyed Monsters by George H. Scithers [ed] (1/9/15)
The Cavalier in White by Marcia Muller (4/18/15)
Ride the Pink Horse by Dorothy B. Huges (1/3/15)
The Case of the Painted Girl by Frank King (1/6/15)