Colour theory is something that sounds a bit scary at first. What it does is help explain and sort colours by using a colour wheel. The colour wheel can also be used to choice a colour scheme!
There are a bunch of different website and apps out there to help you choose or create different colour palettes, such as Adobe Color, Canva and Paletton. Wikipedia's entry about warm versus cool colours:
The distinction between "warm" and "cool" colors has been important since at least the late 18th century. The contrast, as traced by etymologies in the Oxford English Dictionary, seems related to the observed contrast in landscape light, between the "warm" colors associated with daylight or sunset, and the "cool" colors associated with a gray or overcast day. Warm colors are often said to be hues from red through yellow, browns and tans included; cool colors are often said to be the hues from blue green through blue violet, most grays included. There is historical disagreement about the colors that anchor the polarity, but 19th-century sources put the peak contrast between red orange and greenish blue.Color theory has described perceptual and psychological effects to this contrast. Warm colors are said to advance or appear more active in a painting, while cool colors tend to recede; used in interior design or fashion, warm colors are said to arouse or stimulate the viewer, while cool colors calm and relax. Most of these effects, to the extent they are real, can be attributed to the higher saturation and lighter value of warm pigments in contrast to cool pigments. Thus, brown is a dark, unsaturated warm color that few people think of as visually active or psychologically arousing.
Pinterest can be a bit misleading (saw a bunch of pins that had warm and cool a bit mixed up...) But I did create a board with a few good visual explanations and some effective uses for warm and cool fabrics.
Sign up for the swap here The deadline for signing up is February 13. We will do a "last call" at the February meeting!