I have grown several varieties of zinnias. One of my favorites is called Whirligig.
The Whirligig strain contains many two-color and even some three-color combinations.
The Whirligig zinnias contain a mixture of dozens of different color combinations and I plan to grow a lot more of them next year. They aren't all "good" according to my taste, and I do cull and pull out the ones that I don't like, to make more room for the ones that I do like.
ZM