We grew up in New England, so fish boxes were our friend.(the kind used for packing fish at the wharf)

So we had 3 (me, my sister and Mom) people often living in 1 room apartments. Everything was made out of wooden fish boxes. They are quite modular, so we would pick one wall and arrange them for books, school stuff and the TV if we had one.
Another wall would be arranged with 3 stacks that had spaces between with stress rods for hanging clothes...shoes in the bottom cubbies, next row up for medical, toiletries, extra dish soaps, etc...then we each had a cubbie for personal treasures, then above clothes.
My mother would hang curtains over these so it had an open airy feel like a blank wall would.

Now the food and preps storage...My mother made plywood boxes, 5 foot length, and 3x3, with a hinged top. there were 2 of them, and then a 4x3x3 one as well. On the lids of these she added high density 4 inch foam, which she covered with Naugahyde (70s stuff that she could afford and looked like leather...and provided endless jokes about saving the Naugas)

We would arrange these around the room in whatever way worked best, usually along the 3rd wall in like an L shape. ALL of our preps lived in them, I mean 14x3x3 is alot of storage space, and we were cold war era preppers. We had them very organised with all food in 2 of them, then survival gear in the other.
In the day, these would be couches, lots of space to hang out and even have other people over...in the night, we would flip up the lid, pull out our blankets and pillows, and they would be beds.

The coffee table was made of 4 fish boxes filled with water storage, with a board on top...and then we draped two cloths over it. It looked quite nice actually...my mother had great taste in fabrics.

Then the little kitchenette area would just look normal, dishes, pans, spices and stuff. The only real difference is that we would go grocery shopping in our livingroom aside from fresh foods ;)

To walk into the room it looked semi stark, and quite like an Ikea room does now...very clean, open ect...one would Never guess how much we had in there. At minimum she kept a years worth of food and medical/hygiene supplies on hand, as well as our 70s version of bug out/in supplies like a coleman stove, knives, guns, an axe, water matches, sterno, and yes, Spam...etc...

It was interesting growing up in the cold war era...we learned alot about prepping, but it was just called making a fallout shelter.

Now we live in a 32' RV and are slowly working it into a mobile shelter...