Do yuo ever mix yarns?

When I do freeform knitting and crocheting I mix many kinds of acrylic yarns into the same garment. I'm just careful not to mix any wool in there as the washing requirments are so different. And when I'm weaving I also mix not only yarns, but sticks, wool roving, bamboo, raffia, string,cordage and other fibers. If you are never going to wash the item, like in a wall hanging, you have more freedom. If you want to mix yarns and go wild, you should probably check them for color fastness first by dipping a strand in warm water and laying it on a paper towel to dry. If it bleeds onto the white paper towel, don't use it in your project. It doesn't play well with others.