Yeah, we were joking about this in Global Chat. We thought it would be hilarious, maybe as an April Fool's Day gag, to turn ALL public street / public space trees to un-killable, immortal Paper Trees for a real world day. Every. Single. One.
Privately owned trees would be exempt.
LET THEM EAT PAPER.
Coming up with 1,000 amusing names for the Paper Trees for the Great Arbor Day Invasion of Ur would probably be the hard part (after the coding bit, which is likely no mere doddle), but, hey, the community would no doubt step up with enough name suggestions to make it a less onerous burden. :)