Embrace the dark, do not let it limit you. great place for murals on walls - like being in a forest or an island. i have also seen beautiful dark wall papers with gold or silver in half baths, the sky is the limit. at one time i would have handed you 20 pics, but sadly they are all gone.

Since this room is connected to your living room, consider a room screen as an additional opportunity to show your flair. What kind would depend upon your taste and other décor. I recall seeing one (a decade or so ago and in a home I was in only briefly) that had wood (think wainscoting) at the bottom and a combination of window panes, mirrors and picture frames above that.

https://www.google.com/search?q=images+room+screens&biw=1366&bih=673&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjp-enE54rLAhVEeT4KHWokBugQsAQIUQ

@ carolyngarland -- the seat IS down. perhaps you meant the lid?

I would not paint this small space a dark color as it will make it feel too "cave like" I think a rich Gray/Beige would be beautiful, something like Sherwin Williams Mega Greige SW 7031.

My only thing is allow this to be the spot that you do something you always wanted to try, but were terrified to spend all the money.

to me, the more everyone feels like they stepped in a different world the better. These are not my favorites, but they begin to give the feel

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The colors I would not paint: beige, greige, gray, cream - any of those very overdone hues. You should paint it your favorite color.

yep, have not seen purple, but why not? and this from a very nonpurple person.

what about papering your powder room walls with Thibaut Pali in cream on metallic? Full disclosure - I have this paper and love it!

Glad you like it:) I love the way your charcoal wall and your painting play off each other. You have a fun opportunity to continue that in the powder room - a subtle pattern could look fabulous there.

Yes, i see where that gold could really sparkle next to that charcoal. I had a few greats like that. all gone

Please do not do grey or yellow. Check out Great Big Canvas for wall peels. They come off when you want a change & is nothing like wallpaper. I would go with a bright coral with a very very pale light blue on the ceiling (with or w/o clouds. Keep all finishes of metal the same. Thus is one room you can go bold.

Pics of Pali on the wall in my living room.