Adding new walls and floors without CWF/AT?

According to the official SMAPI website, 1.5.5 made adding new wallpapers and floorings (non-replacers) possible without the need for frameworks like Custom Walls and Floors or Alternative Textures. I'm looking to port a few CWF mods to this new version, and I would usually just look at another mod that does the same thing but I'm not finding any. Any assistance would be greatly appreciated.
 
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