The Impossible Project is raising funds for Impossible Instant Lab: Turn iPhone Images into Real Photos on Kickstarter! Transform your digital iPhone images into real instant photographs that you can touch, caress and share with friends.
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).