One of the reasons you'd see so many Brown and Gold wagons was due to the limited choice of interior colors.
The wagons were limited to Cashmere Tan, Dark Red and medium Green interior colors.
The Dark Blue and Heather Grey and White offered on Sedans and Coupes was not offered. I guess they didn't want to have to produce the rear cargo area panels in all the colors.
So when new Wagon buyers came in to pick an exterior color, they had only three to choose from. Wait a minute, that is more than we get today! LOL.
I've never seen a T&C wagon with the green interior. I've seen plenty with the tan interior. Plus I own one with the Dark Red interior.
The fake wood paneling was standard equipment on the 1978 & 1979 LeBaron wagons. But long term outdoor storage would make the raised moldings warp and buckle. Some people would have the fake wood removed then repaint the wagon.
In 1980 & 81 they offered a Non-Wood paneled wagon at lower cost.
But going back to exterior colors, you'd have to pick an exterior color to compliment your limited choice of interior colors. The Tan was the most popular. The Dark Browns and Golds looked good with the tan interior and also complimented the fake wood coloring.
I've seen a few Black wagons. The wood paneling stands out nicely. The dark red interior looks nice on the black wagons. On the white ones too.
I'd think the green interior would only look good on a light green or dark green wagon.