This is my inspiration for the wall above the sink but the wood would go all the way to the ceiling.

The shower will have a screen divider similar to this.

Sorry here’s the picture.

I was all onboard thinking about the movie room then realized you also said mother-in-law suite and presume this bath would be used by them. So I would be of a mind to be a bath that would be great even for older eyes. There is already a lot of movement in your various tiles in the shower so they get to be the star (no pun intended) and the rest of the bath should be calmer to support them. I would suggest using one of the three lighter colors (if it will work with the light grey in the tile and the marble look tile. Is your vanity black or dark blue? It's very pretty.

I like the wood accent in your inspiration photo but notice that the rest of that room is very zen. I think it doesn't fit with the vibe of your bath. I think a great alternative would be a gold rimmed mirror, a good place for you to mix your metals. It might be a challenge but if you could match that deep burnished color in your light fixture that it would be beautiful. I agree you could do the vanity pulls in gold, and altogether you would have a very glam space. A framed 1920s movie poster would tie it in to your movie room very nicely.

You have a lot of tiles in place, and already dramatic dark fixtures. Don't try to make every element a star! I suggest the second-darkest of what i presume are paint chips on the shower curb in your first photo, used on all the walls. That should be enough to give drama without adding too much more chaos. I'd consider regular glass for the shower too.

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You already have too much with the 3 different tiles and the 3 that are porcelain with the natural material sink. Do NOT add more. A bathroom is not a 3 ring circus where every ring is a different act

And yes plain glass for the shower. Good design means editing

I'm all for fun, but you are already over the fun limit.

change that curb top to a plain solid surface. It should not be tiled as you expose the surface to leaking . You are gong to make your MIL dizzy, as well .

Plain clear glass for the shower, black matte handle and hinges

Roaring twenties? Add theater, movie posters from that time.

Do a take on a Hollywood marquee bath vanity mirror

My MIL no longer lives with us but it is an extra bedroom that my husband will be using as his man cave. This mirror is definitely fun. I will have to take a look at it.

@cpartist and @JAN MOYER do agree with the clear glass, as well.

@Jenny the MIL suite is now used as a men’s den/ man cave. But for resale purposes it is considered a MIL suite (a full 5th bedroom). So downstairs it’s a movie room, this bath, and a man’s cave. I think I like the gold trim mirror idea too. The vanity is a really dark charcoal (almost black).

I think you might as well take this bathroom all the way to its conclusion now, and do wallpaper:

This is Cole and Son Regatta Stripe.

I see lots of these bathrooms in new construction and flips with a bunch of different tile, and then a plain semigloss paint color, and plain everything else, and I think it looks like they used leftover tile from a number or projects rather than planned a multi-layered, multi patterned bathroom.

I think once you get to a certain point you have to Commit to the excess.

This is Cole and Son Jaspe Stripe

Get some eclipse glasses : )