DIY bottle cap candles, burn 1 to hours ~ great for travel or to use when you're entertaining on the deck at night.soooo easy to make! These would make adorable little gifts bundled in a bag and tied with a string for stockings etc.
Buy a mirror. Put letter stickers on it. Paint over the whole thing. Peel off stickers. (use canvas instead of mirror. Paint canvas what color you want your letters to be first, then letter stickers, paint over, peel off)
Put tracking stickers on objects that you lose often, like keys, phone, wallet etc. Tell the app on your device what THAT sticker is on ("car keys"). Then when you need to find it, use the app to find that sticker (and your keys).