Perhaps broaden your phone cases to other phones besides iphones. Samsungs, and other sort would be welcome
How about some custom finger spinners? See example … https://www.youtube.com/watch?v=mHlW4dIGlig
Can you do a custom order, one-time? I need a new nut for my acoustic guitar! (See image.) I can take off the existing nut so you can get some measurements (it’s partially broken but you can probably figure out what the missing measurements will be). Let me know what you think.