A kind of a small spotify hardware player (like an iPod nano) would be great. With this it should be possible to listen to the music (offline), like with a smartphone when there is no internet connection. After 30 days you need to go online to approve your license (connect player with your PC so it can establish a connection with the spotify server). It would be great for sports, fitness, running (since everybody has a 5.5" smartphone) or as a USB stick for your car radio or integrated USB interface. Useful for car owners without bluetooth or integrated spotify service.
Hi and thanks for your contribution! A similar idea has also been suggested here:
Add your kudos and comments there please!