I originally explored light graffiti with my middle school students. After working with only elementary students for a year, I thought I'd give it a shot - see what they could do with some flashlights in a dark room.
I started out by scouring the internet for videos explaining light graffiti. I used these with my students: Talk Talk TV Commercial using Light Graffiti and Light Graffiti Tutorial.
Next I used black paper to cover all the windows and doors in my room - make it nice a dark. We had a bunch of flashlights we used for the musical earlier in the year, so I borrowed those from the music teacher. I then contacted a local theatre and asked to have their theatre gel scraps (thin plastic they use to color lights in the theatre). I gelled a bunch of flashlights for different colors. Last, but not least I checked out a digital camera from the computer lab - set the correct aperture on manual setting (by trial and error). I hooked up the camera to the TV in my room so that the students would get immediate feedback.
The students and I watched the videos - then we gathered around the open space in the room - I had students in pairs pick out flashlights and move around in front of the camera. Each pair of students got two turns. The first picture they see immediately on the TV - they can actually see what they drew. The second turn is almost always better - the learning curve. The students not only learned by doing, but by watching each other. One class a student moved up towards the camera and then back - creating something the class hadn't seen - after that the students were much more curious and adventurous.
We did light graffiti for two cycles. The second time the students came we tried to make pictures. I had slips of paper with words like: cloud, tree, house, mountain, sun. Each student was in charge of making that object. In a group they had to plan out their picture. We drew them on white boards, practiced in the air and then did them for the camera. Some were more successful than others - but they enjoyed trying.
All these light graffiti pictures were made solely by K-4 grade students!