Great thread! I'm so glad I found this since I'm doing some similar work in my home.
I haven't seen these things mentioned, so here are a few more ideas. These are all "small stuff" but for me, taking care of a lot of the little, neglected details has been helping me to feel better about my home. Even though none of these things is major, leaving them the way they were just seemed to reinforce the sense of apathy I had. I lived in a house where noone cared about the dirty windowpanes, the scuffed paint, the mismatched hardware, etc. Caring for the little details made the house feel more like home.
1) Scan each room for minor scuffs, worn-out things, chips and nicks, etc. Fill in chips and nail holes. Touch up paint over these and other scuffs and blemishes.
2) Replace switchplates and outlet covers (new switchplate/outlet covers were $1.75 for a pack of 10) or even just replace the screws if the plate is good but the paint is chipped off the screws. It's amazing how this little improvement helps things look fresher.
3) Clean out crevices, corners, air duct openings, etc. (The places that don't quite get thoroughly cleaned with ordinary housekeeping.) Replace the air vent covers if they look old and worn out or too dirty to clean.
4) Consider some new hardware for drawers, cabinets, doorknobs, even faucets if you can afford it. I couldn't afford major changes like faucets, but I did find some cute drawer pulls and new doorknobs for a real bargain price online and replacing these gave the place a very different and updated feel.
5) Remove old caulk in bathrooms, kitchen, etc. Replace with fresh white caulk. You'll be amazed how much cleaner and new everything looks.
6) Replace inexpensive, but relatively high-impact, accessories like shower curtain, doormat, table cloths/runners, outdated light fixtures, old lampshades, etc.
7) Clean all the windows and glass inside and out really thoroughly. Things will be much brighter and fresher.
8) While you're still thinking about #7, go through the house and replace any burned-out lightbulbs. This should be obvious, but until I consciously made the effort, I didn't realize how many bulbs were out. The house is brighter now, which makes me feel happier.
9) Trim bushes, hedges, trees, etc, and cut back weeds, brush, etc that block the sun or look out of control. Keep the porches, walkways and driveway swept. Plant flowers if you like.
10) Put out some new and updated photos of your family. I hadn't changed family pics in forever. Having special pics up of the people I love makes home so much more homey. I didn't realize how much impact having new pics would have. With current images of your family all around you, you're less likely to feel like you're "just passing through" that home.
Hope some of these ideas might be helpful.