There was a request for a wall at BPS so being the minimalist that I am I made 10 sets

These however are overlays and can be placed on any wallpaper of your choice. You will have to use the cheat BoolProp Snapobjectstogrid false to place these and it can be a little tedious, but probably better than another 500 walls in your game :tt2
There are a high wall and low wall version in each color making 60 overlays all together just delete what you don't want. You will need Pixelhate's overlay mesh for these to show up in your game and you can get the mesh
HERE Colors are as follows:
White

Porcelain

Federal Blue

Cream

Canary

Beach Blue

Barn Door

Bad Barbie

Aquarium

Hazelnut

Download
HERE