What are some small changes you can make to your home that can help improve it, at a low cost?

We have an older home and are constantly doing little projects to update it/make it our own. Most recently we put new peel n stick tiles over old crappy ones in the basement. not my idea flooring but for $60 it's a small change that helps me live with it for now. Last year we changed out all of the door knobs on the bedroom doors. Paint also goes a long way, and we just covered up all the window trim with white paint.