Here are a few of my concept ideas, most pretty detailed in my head:
The Joker (Batman's villain):
Ice Cream Van
Stolen Arkham Asylum staff vehicle, customized by The Joker
Circus van A
Circus Van B (based on truck in The Dark Knight movie)
50s-style Jokermobile
Two-Face van (split left/right)
(More)
Retro Repro:
Divco
Morris Minor Traveller
Austin A35 Countryman
International Metro
49-51 Ford woodie (or a panel, which didn't actually exist)
"Hot Rod"
Generic Woody/Woodie
International Harvester Farmall (IDEAL for a red xB, either RS6 or the new stock ones)
Surf Wagon
Radio Flyer wagon
Flexible Flyer (the sled-type)
Delivery Van:
Railway Express Agency (REA)
Milk
Candy
Auto Parts
Other, fun/interesting theme- either real or fictional. I've made up several dozen ideas of this . . .
Nautical:
Pirate Ship
Submarine (one idea for CSS Hunley)
Sports:
Team (have several I've played with)
Zamboni
Hockey (works particularly well)
Rally Car, 80s/90s
Rally car, 60s-style
Rally Car, 2010s WRC
Plane:
B-25
Betty Bomber
Nakajima (MANY specific ties to the xB, esp. the origins of Kanto Auto Works, who built the B)
A-26/B-26 Invader
Mosquito (British night fighter)
C-123
C-130
AC-130
C-119
Air America (50s-70s airline, NOT radio station)
Star Wars:
Yoda (make INTO a giant Yoda- Ideal for xB2.5 in Sand)
Millennium Falcon
Tie-Bomber
Lamba Class Shuttle
Slave 1
And that is just off the top of my head . . .
Edit:
If any of those strikes an interest, let me know, and I'll outline my idea more.
I'd LOVE for ANYONE to grab one and run with it.