Storage hacks that suck

I live in a very small house (I hesitate to call it a tiny house because those are smaller), so I am always looking out for ideas to maximize space, usually on Pinterest. I've read the vast majority of the hacks out there, and many of them are useless due to the way my house is set up. Here's what I mean:

1. Hang organizers from your doors! I have exactly two doors in my house. One is the front door, and one is the bathroom door. I am loath to hang organizers on either. It would look weird on the front door, and I have never seen or heard of anyone putting organizers on their front door. There is a towel rack attached to the back (inside) of my bathroom door, as well as some hooks, keeping me from putting a hanging organizer there. I also think it would look weird to put it on the outward side of the door, since guests (and anyone who looks through the windows) will see it. Such is my dire need of places to store my shoes that I would consider putting an over the door organizer on my bathroom door anyway, except for the main reason: these organizers always come with thick metal square hooks to hang them from the top of the door. These are always too thick to let you close the door properly, because whoever first came up with them did so in a time in which all doors had a 1/4 inch gap all around (I'm guessing) and no one has changed the dimensions since, even though now the gaps are 1/8th of an inch or less. I live alone and don't mind having the door ajar when I use the restroom, but it's awkward when guests come over. I had an over the door organizer on my bathroom door in my last apartment, and when my private father needed to use the restroom, he forced it closed and ripped twin chunks from the door frame. I was worried I wouldn't get my deposit back, but luckily the landlord didn't look up. As you can see I don't want to go through that again. Plus a non-ugly shoe organizer/rack is hard to find unless you want to spend a lot of money, which I never do. I have two closets, but they have heavy folding doors with handle pulls right in the middle of the narrow panels. It's a nightmare. 
2. Store things under your bed! Listen, my bed is approximately two centimeters from the floor. It is a nice-enough modern bed with squat plastic feet and a padded headboard that is so short it is blocked by my pillow, since I have a box spring and a mattress and I think the manufacturers assumed everyone would just use a mattress. Use bed raisers! Pinterest yells at me. My bed's squat plastic feet? Are shaped like rectangles on their sides. All bed raisers are built for round or square bed feet, even though low-slung beds have been having a moment for some years and you'd think someone would get a lightbulb over their head and make bed raisers for rectangular feet. But no, I am doomed to have (four centimeters of) wasted space under there. I briefly thought of resting the feet (plus the hidden one in the middle) on cement blocks, but what if the legs slipped off? I don't know how to make that stable. Oh, how I wish I hadn't been seduced by the low price and padded headboard and bought a bed that was actually high enough to slide my under the bed rolling organizer under. I actually wish I had had the brains to buy a storage bed with drawers underneath and a bookcase for a headboard. That would have been ideal. 
3. Hang organizers/pot lids on the inside of your kitchen cabinet doors! Do none of you have shelves in the middle of your cabinets that go all the way to the front of the cabinet? There is just not enough space there. 
4. Store dishes and pot lids vertically, or on a stacking organizer! Use shelf risers! Again, shelves in the middle of all but my below the sink cabinets. I guess I could try taking the shelf off its supports in one of my bigger cabinets, but it sounds like a pain. 
5. Use the wasted space above your doors! My ceilings are incredibly low. I can just reach up and touch the ceiling downstairs without any effort, and I've whacked the upstairs ceiling several times when taking my shirt off over my head. I think it's 6.25 feet high, and maybe 6.5 feet high downstairs. There is no space above the doorways, let alone wasted space.
6. Any kind of modification that requires actual construction: this is a rental??? I mean I wish I could install a tiny broom closet between the studs of my house, or build under-stairs shelves that you can pull out, or hang cubbies on the wall. I'm not even supposed to be using that many pushpins for my pictures. 
7. Use an old chest or trunk as a coffee table! My "living room" area is so small I can't have any coffee table at all. I have one ottoman and it's against the foot of my lounge.
8. Use the dead space behind doors! See #1. Also, my doors don't have that kind of dead space behind them. 
9. Install shelves or rails below your kitchen cabinets! Low ceilings strike again. I have narrow counters as well. 
10. This is not an impossibility, but I kind of hate articles that suggest you get all-new furniture. What do I look like, a Vanderbilt? I have half a dozen chests of drawers from 2 different childhood bedroom sets as well as the childhood bedroom set of a cousin's cousin (hand-me-down squared!). My chaise lounge and plastic storage drawer unit were inherited from my grandma, my table and chairs from my best friend when she moved, and my garment rack from my parents or my sister. The only new furniture pieces are my bed, my bookshelves, my other plastic drawer units and my kitchen cart, all of which were scooped at low prices. Do I look like I have money to buy all-clear furniture, or furniture with hairpin legs? What I get is what I have. 

Anyway. I'll stick to trying to wring as much storage space out of my tiny weird closets as I can. Share any tips you have in the comments.