Rainbow designs are of course full of color and add a special brightness to typical 2 to 3 color designs. Represent the whole spectrum of free loving rainbow shirts. We're talking the cute ones with arches, to the rainbow color panda faces, even a murdering unicorn taking out a rainbow. The wide color range provides plenty of vibrancy and life to any fashion style. Most people at least have a couple rainbow t-shirts, tank tops, sweatshirts, phone cases and art prints in their collection.