This is some of the best examples of this kind of work that I've seen. Beautiful, well thought out compositions by this team of German photographers simply called LAPP. Check out more of their work and learn more about them at their site > HERE
I love this stuff...I've posted a fair amount of graffiti-based projects (click here) and this is one of the better ones I've seen in a while. I like the simplicity of it and that it speaks to the temporary nature of graffiti. Unlike traditional graff that can been seen and exist with out photography but is sustained by photography, Halo requires photography to capture the moment making the act of graffiti an interactive experience.
Halo is one of many projects by French designer Aïssa Logerot go to his site for more info and other projects which really don't add up compared to this one. AissaLogerot.com