For big rooms, consider rich, warm colors like deep blues, earthy browns, or warm grays. These can create a cozy atmosphere. You could also go for textured wallpapers to add depth. Smth like wallmur canada and wall murals usa https://www.wallmur.com/
Darker, warmer tones can make a large room feel more intimate. You might also think about wallpapers with large-scale patterns; they can make a big space feel more inviting. You can check out both local home decor stores and online retailers. Some specialty wallpaper shops might have unique options. Don't forget to order samples to see how they look in your space.