I decided to make a wall and floor mod....so with some help from Playtonymous' template file for Custom Walls and Floors and the cream/beige stripes from Haleatsburrito's Yet Another Wallpaper Mod, I finally made a mod.
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File credits
Playtonymous' template file for Custom Walls and Floors Haleatsburrito's cream/beige stripes from Yet Another Wallpaper Mod
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This mod REQUIRES SMAPI, and Playtonymous' PyTK mod and Custom Walls and Floors mod.
Just drop the file folder into your Stardew Valley Mods folder like you would a Content Patcher Pack and it will add the walls and floors to the wallpaper catalogue!
I'm not sure any of the walls and floors really go together, but I'm quite happy with how they turned out.