Inspired by the string art of Petros Vrellis, we propose to develop a digital thread-toning algorithm for color images. The process of representing an image with thousands of threads has fascinating connections with both classical image processing techniques such as half-toning and dithering and medical imaging devices such as PET. It also provides an excellent algorithmic and artistic playground: the code for greyscale images can be written in a day, but achieving high-quality results in a reasonable time is a challenge. Several approaches to thread-toning exist in the literature, but the problem is less-well studied for color images, where we believe the connections to color printing theory will be valuable.