The James Bond GB.
Make a what-if vehicle, building or gadget from a James Bond movie. It might be your alternative take on something from a real James Bond movie, or the movie itself might be the what-if, in which case you get to outline your own script, which might play it straight or be a parody.
The beauty of this is that, on the one hand, it has a sharp focus in order to concentrate minds and produce a coherent set of entries, but on the other hand, it's very inclusive of different modellers' preferences because it covers cars, planes, ships, spacecraft, buildings, and even 1/1 scale props, and can be entered by physical modellers, profilers and story writers.