If the winner doesn’t supply a theme before Thursday 22:30 GMT, the organizer will select the theme. In this case, the winner’s theme will be used the next time we are lacking a theme on Thursday 22:30 GMT.
Having selected the theme, the winner will not be eligible to enter that week. They may however still submit an image, but it won’t be included in the voting.
I used freestyle, so the lines are more like a post-processing effect. I used some modifiers for altering the thickness and some other stuff. And while it is a still frame, this setup can be used for animations too, almost without flickering.
The materials are a basic setup around the shader-to-rgb node, which reacts to a sun light.