Zacharias Reinhardt writes:
In our free public group called “Weekly CG Challenge” you have the chance to improve your CG skills by doing 3d renderings or digital 2d art about the weekly provided topic.
We run this facebook group successfully over 5 months now, with more than 1,4k members. Most members are Blender users btw. In the last months various sponsors have sponsored great prizes for the weekly winner. Now we have expand to Google+ to reach more users and also we have a great sponsor the most of you certainly know: Chocofur! They are sponsoring blender model packs for the winners.
If you want to improve you CG skills and get feedback by the members and maybe win some nice 3d assets, join us!