I found a Gap ad in a 90s Vanity Fair magazine; the background was completely white, perfect for doodling a background on it. I also highlighted the woman's freckles and lips with a bronze Sharpie.
These are some gesture drawing sketches I did in ink with white pen highlights on brown paper. I was in Europe and sitting around a fountain watching people go about their lives. This was a really fun figure study and I think people make for great works of art.