Maybe ask someone like Bagginsbill or a Poser genius to share a concept they had and have a thread showing how they worked it out...

not just the end result... but how they thought through the material shader nodes... how they attacked the problem of morphing some body part... how they had this great idea for a scene at night with rain and fog and they accomplished it.

Challenges are good... if the people involved are open minded, forgiving and mostly just wanna have fun. When it's serious... folks tend to not participate as much. It's gotta be for the fun and camaraderie aspect I think ( yes, I had to look up how to spell camaraderie  - :P  )