Hoverboarding
Pure (from scratch) - I used Inkscape for “Major Tom’s Flakes”-advertisement and Gimp to adjust the overall contrast.
It’s morning on Mars, and the yellow school shuttle is on its way. Cool kids, however, hoverboard on a Marty McFly memorial board to school. All advertisements, street signs and the like are holograms. Hence, they are partly projected onto the road and can be flown through without danger.