One very small (but highly effective) things that I grew up with in my parents' house was the presence of nightlights in the hallways. They only came on when the hallways were dark; as a kid, this was highly useful when my imagination went into overdrive and I thought monsters were going to jump out at me from the coat closet.
[ Photo from Stephbot ]
Ever since I've lived on my own, I've always kept a nightlight in the hallway. It's mainly due to habit; but it's definitely saved me from a lot of stubbed toes, numerous cases of having the heebie-jeebies, and tripping over rugs and dog toys.
Do you keep a nightlight on in your home? Do you have any little things that you do that makes your home feel a wee bit safer?