So a recurring thing that's come up when discussing ideas for games with friends, or just thinking about ideas: what are the most absolutely essential graphical assets for building a world?

Obviously, the answer will vary heavily for each game, but for some types of settings, the basic "starter set" is pretty universal. For example, nearly all house interiors will have a bed, at least one type of table (almost always dining), and at least one type of chair that goes with the table. After those crucial basics usually they'll also have some sort of shelf, a dresser, and kitchen counters and a fridge. Outdoor tilesets in 2D pixel art games typically need grass or other ground tiles, path tiles, water tiles, at least one type of tree, and at least one type of rock. From that point, you can expand to include things like fences, buildings, benches, lampposts, etc.

Trying to figure out a full list of assets needed for any game can be daunting, so I figure I'd ask for input on what you consider the most vital for various types of settings. Starting with the absolute barest necessities for building a basic map (so you can at least plot basic layouts and try to get a sense of the art direction), followed by the most commonly featured items. Could be for individual rooms, specific buildings (like gas stations or restaurants), or specific types of areas (jungles, farms, beaches, etc.).

Side-note: yes, I know you can use placeholder assets. But it's also helpful to just have a general list of what basic items are needed for reference.