The one Prep idea i never did get to write was unFinished.

Something about a finishing school, except in a very sci-fi way where you get intrusive implants and things.

The idea i got stuck on is "Freeborn"  [18+] because, yeah, this is a multi-novel series with many years in Prepping and NaNoing at this point. On the plus side, the whole thing has come so far since I started that idea.