A bit more subbdued colors are perfect for bedrooms.
A gray bedroom for example can be very relaxing and calm to look at and gray is also a great backdrop for accent colors like turquoise, pink or purple!
I really like this bedroom designed by Casa Forma. The different shades of gray look beautiful and very peaceful. I would have chosen a different kind of a lamp though, for example the Cellula chandelier. In general - I think this really works!
Another gray bedroom, fresh and beautiful! I would have removed the weird green plant and added some curtains to the windows...
Dark gray à la Calvin Klein.
The artwork above the headboard is a bit too much, I think this room would have looked much better without it.