To go with things like the tiles and wainscoting, I mean. (Or possibly by itself, sure!) Nothing super busy, just some simple patterns - stripes, florals, that kind of thing. Less saturated paint colors like beige and gray would be nice too!

This would be really neat, I always loved the backgrounds that looked like home interiors and would love to see more.

I'd like some new backgrounds to stock in Home Appliances. We have hardly any indoor ones.

Excellent Idea! While we're never going to have houses to play with, the Home Appliances items could certainly simulate a simple home setting. Wood paneling, wallpaper (would love some old Victorian cabbage roses!), stucco...all sorts of wall treatments could work.