As a big fan of the retro look, I used to run Onza Canis and Ibex skinwall tyres in 26 inch. Whilst they look great and are super light and fast rolling, the sidewalls were made of cheese and slashed really easily on the South Downs. They also lacked side edge grip, so cornering was pretty sketchy, but fun!!
I bought some of the new super ground Schwalbe Nobby Nics (much better than the old version) in 26 inch with the original skin wall colour late last year from CRC. Whilst they aren’t as light and they are much yellower than the Onza’s, they grip well, roll fast and the sidewalls are much tougher, a perfect all weather all rounder. I’d highly recommend them.