Happy New Year! In winter, I often choose to work on very bright pieces to counter the gray skies outside. "Playing with Crayons II" above is a rainbow of brights, using the ROYGBIV scale. ROYGBIV is an acronym for the colors of the rainbow--red, orange, yellow, green, blue, indigo and violet. These colors are the visible part of the light spectrum in scientific terms.
My starting point was the strong yellow diagonal in the center, because I wanted this quilt to really catch the eye. The "warm" colors of red and orange move down to the left and the "cool" colors of green and blue move up to the right. The purple in the lower left corner acts as a bridge to the deep blue in the upper right. The trick here, as in most of my work, is to use lots of different fabrics within each color grouping to make the whole more interesting.
Here's a sample of how other TAFA artists on Etsy handle a rainbow color scheme: