I'd vote paint like
@Micca. Wallpaper I noticed in newer homes around me is starting to make a comeback but in terms of changing it paint is def. easier.
There's this new kind of wallpaper though that I saw on some Flip or Flop Vegas tv show where it's a peel and stick so no messy glue to put on or to take off but I haven't seen that kind of wallpaper in person to know if it looks good or not.
I'm loving your bathroom though especially the tile insert.
We're painting the inside of our garage at the moment...well whenever the temp is under 90 and we're up to it. I know I know it sounds strange to be painting the inside but the builders sprayed a knockdown texture on the walls so it does look nice when painted. I've just never really liked the mud and taped look of a garage.
Eventually we'll epoxy our garage floor (well that's the plan that is) and we were going to do it before painting the garage walls but alas it went from winter to summer here and the epoxy needs to be applied when it's under 85 degrees......and it's not been like that even in May really. So now we have to wait for fall to do the floor.