Usually I like that everything in Sims game is clean, shiny and new, but occasionally I like to design old-looking buildings, like haunted houses etc. It would be really nice if there was a "decay" feature in build mode, which would add randomly some additional decay layers to the wall/roof/floor/fence etc textures (smudge, cracks, dirt etc). That decay feature could have few different steps (and separately for outdoor and indoor), like slight / average / maximum, so it would be useful for different tastes, when you want to design slighty old looking building or totally decayed mansion.
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Alternatively, I think being able to use terrain paints on walls and objects would be nice, since we could add dirt and grass effects. I know that in Sims 3 it was possible at some point to do this if you played around with terrain cheats and embedded an object, but they fixed it at some point.