A few random thoughts, for amusement...
I'd love to see a late model Ford Police Interceptor/Crown Vic done with police gear, like the Charger.
Station wagons...main stream stuff, like the Ford Taurus from early 2000.
50s & 60s trucks are great...I have a couple of projects that could benefit from a nice International pick up!
Late model CTS, CTS-V...Wagon, Coupe and Sedan.
How about some of the big guys big sellers? Ford Fiesta, Focus and Fusion, Chev Cobalt, Dodge Caliber, that type of entry level car.
I grew up in the 60s when every fall the model year changes happened...I love the big cars of that era.