Artist Thomas Mailaender was once described as "an insatiable and compulsive collector of photographs and sociological patterns." For his project titled Illustrated People, Mailaender selected old photographic negatives from the Archive of Modern Conflict and placed them on the skin of volunteers. By shining a UV lamp over them, he sunburned the images onto their bodies. You can see more examples from the series at Juxtapoz.
Content warning: a smidgen of artistic nudity.