I loved the Branle paper birds by fiatjaf, especially Elidy's updated birds for  nostr.org. 
Nice way to imagine notes fluttering away through relays, also censorship resistance through resilience/easy to make new paper birds.

 https://image.nostr.build/5330d39681efa0e6c653dffde66cd540742f87ce57f49e69e3062e22299fed32.jpg