I was in a similar situation with silvery wallpaper I ended up painting the walls very pale grey- just grey enough so that white photo frames etc. look nice on it. I have bright sunshine yellow with it to make it warmer- and thinking of adding bits of turquoise and magenta as well to make it a bit more cheery :)

White would look fab, especially if you have a wooden floor. I’ve got a very dark hall and stairs and I painted it Dulux Egyptian Cotton but it’s maybe a little dingy. A very pale grey would also work. Pick a grey you like then go a shade lighter as a dark hallway can make many greys look dingy too. Good luck.

I'd go for a pale greige/tan/taupe/clay, as in nearly off-white-pale. Something that blends really well with the wall tile. But your example looks great too (a bit too dark for a bathroom, if you'd ask me). White ceiling to go with trim/woodwork. (sidenote: just googled skimming stone and that looks a lot like what I would choose)

Your house looks fab and the hallway seems to be spacious - you lucky thing!! I think dark blue could work well - my own hallway is white but with one wall painted dark blue - and I love it. However I’ve got serious house envy (and specifically hall envy) at the moment of a blogger who I also follow on instagram - your hallway made me think of hers because the height of your picture rail is similar to the height of some panelling that she’s added. She’s used lovely pale muted shades, and I think it’s gorgeous. https://malmoandmoss.com/home-1/2019/12/6/03ehb3k5ckvleip5u7tunnvgqnoc3o