I'll do that.
Being a fellow Washingtonian, most of my map ideas are centered in the state.
My chief ideas are 1. The Chehalis Western Railroad (Would make a nice logging scenario), 2. The Milwaukee Road's Raymond branch (From Centralia to Raymond), 3. The Cowlitz Chehalis and Cascade Railroad (Typical steam era shortline, chief products would be logs and farm products).
I would also like to see a Japanese Metra map based in the greater Tokyo area (Large enough to represent the Tokaido, Yamanote, and Shinkansen lines in that area).