Faraday bags are very popular at the moment. They can be used to store cell phones, key fobs, credit cards, passports, and other items. They block wi-fi, bluetooth, cell signals, GPS, and RFID to prevent attempts to hack, track, and spy on you and your movements via your devices.
These would make great gifts for any occasion. Plus, they are currently selling online for around $75.00, which would be a nice royalty for designers.