This poster is double-sided, but the side above is my favorite. It can be found at Dick Blick or Amazon. This is a close-up of the poster.
As you can see, for each color, the possible ideal color combinations are shown. The opposite side of the poster shows the colors illustrated with quilting fabrics.
It is by Joen Wolfrom. She has many quilting and design books, plus this handy color tool.
And, if nothing else, the poster really brightens the studio!