The colors and names for each set have also ... Counter Blitz (Green/White/Blue) based on Final Fantasy 10, and Scions of Spellcraft (White, Blue, Black), based on Final Fantasy 14.
The background color is inspired by International Klein Blue, a hue that the artist Yves Klein first mixed in the 1950s, using it to make an array of monochromatic paintings until his death in 1962.