The Yafaray is hosting a rendering contest on architecture.
Alvaro Luna Bautista writes:
To celebrate the release of YafaRay 0.1.5. we have organized a summer contest which runs from July 1 to August 26. The contest topic is Vanguardist Architecture. The idea is to depict and render futuristic architectural ideas and forms but you could also pay homage to vanguard architects and movements from the past. We are looking for awesome modelling and rendering in final works.