If you're interacting with something every day, talking about things like your phone case, your wallet, maybe a pocket knife or keyring, any of those objects should make you happy, or at least not cause you any anxiety. Think of how many hundreds or thousands of little interactions you'll have with that thing, and multiply the feeling during that moment, and consider the net emotional total during the lifetime of the object.

I had a number pad that I was using almost every day, but it was a bit crummy, so I splurged and got a better one. If I have to use this thing all the time, then by God I'm going to enjoy using it!