Just caught the new Astro Boy movie, and was surprised to see stencils weigh prominently in many of the scenes when Astro is on the planet. The bumbling Robot Revolutionary Front managed to cut out a stencil and paint their robot bodies. Sparx, the "brains" of the RRF, seems to have some cans of Krylon on his tool belt. Astro and a group of kids then "tagged" the giant robot ZOG with stencils of arrows and triagle fangs. As the RRF prepares to sneak into the Robot Battle arena, they slapstick in an alleyway that has RRF stencils on the wall behind them. Yet another RRF stencil appears to be tagged on a billboard at the entrance to the arena.
Here are a few grabs from the Astro Boy site, which are in the Stencils in Media Archive.