I came across this company recently, based in Israel, making custom bike parts. It was the wooden Brompton mudguards that caught my eye; the ultimate classy addition.
The quality looks amazing, but the prices reflect it; a set of mudguards will set you back at least £90. They have stock designs, but can do pretty much anything you want, but they’ll be even more expensive. I guess class doesn’t come cheap! They’re defintely worth a look though…check out their blog here and their online shop here.