The simplest #1 idea I can think of that has the highest chance of getting council permission is a simple Sundial with a single polished Fangy fin as the gnome. The hr lines could be standard or Fangy/windsurf related, i.e. design time, rig up, Fang time, beer o'clock etc with some witty plaque underneath.
Other ideas to follow but it should be noted I have a bunch of Fangy inspired fins photo below (this not the complete set) that can be donated to the project if required. I am sure Michelle has at least the same amount or more of experimental fins she doesn't know what to do with, so more crazier/brainstorm ideas (much less likely to pass council approval) below.
#2 Fangy fin tree sculpture...a bunch of all these fins bolted to a cone shaped structure. Could be placed above head height to reduce safety concerns.
#3 Game of Thrones "Fangman chair", replace all the swords with Fangy fins or windsurf related junk (as Ross couldn't throw anything away). Could change this concept to a simpler bench.
#4 Fangy fin kinetic structure that moves/spins in the breeze..again above head height
#5 Fangy fin rainbow arch.
#6 Fangosauras. Fangy fins look similar to Stegosauras plates so make a steam punk stegosaurus using junk and fins as the armour.
I know Ross has a bunch of epoxy and donated some to me so could encase hazardous objects/edges in epoxy.
I'm no artist but happy to help with construction if I can.