Keychains
You take it out twenty times a day without thinking. Coming home, leaving, rummaging through the bottom of a bag. It's the most common object in the world, and that's exactly why you engrave something on it.
A first name cut from steel. A date surrounded by a heart on a calendar month. Or a keychain for each family member, joining together into a single piece. Engraved in metal and not printed, it withstands keyrings, pockets, and years without fading. It's the perfect gift for someone who doesn't wear jewelry.