Nope.
I have oodles of colors CDC, and in the early years I tied the pattern in a variety of color combinations. No longer.Do you find enough colors in CDC to imitate the various species of Caddis?
For the past decade or more I have parred down to three combinations only:
Natural/natural (95%+) for imitating pretty much any caddis species and pretty much any mayfly species. Plus I use it as a general search pattern.
Yellow/yellow - for the yellow sallies and the sulphurs.
Black/black - as a cricket imitation.
Cheers,
Hans W