Stumbled upon this on DesignTaxi.com. Designer Audra Hubbell project large letters on buildings in Chicago for her 'Letters at Large' project. It explore typography in urban settings.
Most of the projections used works or phrases, but as you can see she also did individual letters matched with backgrounds that would accentuate that letter and highlight the architecture at the same time.
I love her use of lighting and switching between serif and san serif. Lovely combinations!