Since the official store is closed for new purchases, here are the best places to find dynamic themes (both free official and custom-made).
The PS3 in 2021 is a nostalgia machine, and dynamic themes enhance that experience more than you’d expect. While Sony has moved on, the community has not. With a USB drive and an hour of browsing, you can transform your XMB from a time capsule into a vibrant, animated gallery. ps3 dynamic themes download 2021
Installing CFW may get your console banned from PSN. Use only on offline consoles. The Digital Ephemera: A Eulogy for PS3 Dynamic