Use the cylinder from a Scott Tissue roll to store your power cords for portable appliances and tools. All you have to do is roll the cord as it was when it was new and put it into the cylinder. It keeps the cord secure and you don't have to find an extra-large twisty tie.
Save the closet in the empty bedroom for the opposite season's clothing. Also use the space under that bed for clothing storage boxes. At the end of each season, just change out closets!
When we moved to an apartment, we eliminated one of our TVs and had an extra stand. Our powder room is quite large but doesn't have a linen closet, so we put the stand in the powder room. It now holds books and reading material on top, plus a large candle and figurines we had no space for elsewhere. On the shelf where the VCR once stood, we now have extra hand towels and wash rags, and in the cabinet below we store extra shampoos, body washes, make-up, toilet tissue, etc.
Save toilet paper or paper towel rolls and store your extension cords or other cords in them. Keeps them from getting tangled and twisted.
Save the clear, rectangular plastic bins pre-washed lettuce and spinach come in from the warehouse stores. They are the perfect size for a pair of shoes and come with lids, so they stack well. Because they're clear, you can easily identify what's inside. These bins are also great for storage of just about anything. Crafts and kids' little toys are easily contained, and when you don't need them anymore, the bins can be recycled.
I have a closet right across from my kitchen where I've hung a shoe organizer (the kind that hangs from the rod with square compartments for shoes). In it I keep new paper towel rolls, my kitchen linens, dishrags, plastic bags, plastic wrap, foil, etc. A roll of SCOTT towels fits in one compartment perfectly!
Our freezer would always be jammed with meats and we could never find what we wanted to. I now have my frozen items in storage bins. I label each bin with the type of meat (chicken, pork, beef, seafood) so we can always tell where to find what we need, and everything is in its place.
When I'm finished painting, I clean my brushes and slide them into a long cardboard tube from SCOTT paper towels. The bristles stay safe and can continue to dry safely. I made a brush caddy from empty SCOTT toilet paper rolls by gluing several empty rolls together and standing them on end. It keeps the brushes, pens and pencils nicely organized and upright for easy selection. The rolls can be painted or decoupaged to your liking and last quite a long time.