You could draw one or several card and decide to use the key colors they depict in your art (be it painting, sewing, etc). You could do that using a particular symbol that resonate with you.
For colors choice you could also use the color scales attributed to each card according to Crowley in the Thoth Tarot. For example, The Lovers correspond to Orange/Pale Mauve/New Yellow leather/Reddish grey, inclined to mauve.