I completed a stealth knitting project a while back. It was a pair of custom-knit mittens in Cascade 220 Superwash DK yarn.
My friend, Francey, wanted a pair of mittens with the Colorado State University mascot, Cam the Ram's symbol on the palms and CSU on the back of the mittens. Those of you with a discerning eye will note the ram is a modified version from my 'Rams and Yowes' blanket. She found the colour of yarn she wanted and mailed it to me while I was in Ireland. The package with the yarn was waiting for me when I got home.
The plain mittens knit up very quickly. For such a small amount of the white, I just duplicate stitched the ram and letters with the white yarn. Basically you are duplicating the path of the yarn that you are covering. It is fairly easy to do and works well on small amounts of colourwork. The stocking stitch fabric also remains quite stretchy.