We love those small, simple solutions that just make things easier. Years ago, organizing work projects by color was one of those. Then came the carabiner-type keychain that attaches to the strap of our bag so that we're not always fumbling for our keys. Our most recent simple solution was putting casters on our mother's cedar chest that resides in our apartment. It was inexpensive, very easy to do, and it made a huge difference in being able to move a heavy, awkward piece of furniture around a small space. And it looks better, too.
Are there simple solutions that you've come up with that really made life easier for you? Do tell.