CMYK is the four-color subtractive offset printing process, with the letters refering to the colors used - Cyan, Magenta, Yellow, and Key (black). Open up most home inkjet printers, and you'll see it in action.
Artist Evelin Kasikov recreates the process with embroidery thread, using color halftoning to amazing effect.
Urban Threads' Niamh O’Connor has made a keen observation: "For some reason the embroidery industry hasn’t much tried to cater to dudes, and likewise they don’t seem to be too crazy about the idea of cute applique bunnies sewn onto their shirts. So, largely they have been ignored."
Ignored, indeed. So she created this great how-to, complete with some hardcore embroidery, bleach stenciling, patches, and some super easy scrappy-stitch adornments.