Lisa just a word of caution. Glass tile in a wet area has many risks. Don't assume your installer is qualified for glass installations. Special setting techniques are needed. Get the installation instructions directly from the manufacturer and make sure it's followed. Most require special mortar while some require mastic which can't be used in a wet area. Some glass can be installed over a impervious waterproof membrane while others no. Some Ok with epoxy grout others not. Be sure the glass can withstand the thermal shock from being cold to being hit with hot water. Research glass tile ghosting. Best of luck with your project.

My first collection of comments are related to your revised drawing/plan: As I look at your revised drawing it doesn't look square. You state that the room is 6x6. But even so I think you will only get about 19-20" between vanity and toilet. Unless you got an 18" vanity, which is what I did in my East Bathroom that is 6.5' wide. If you remove the chimney you could put a window there. I've placed a small window in my West Bathroom, that previously was lacking one, and I love it. In my West Bathroom (I show in the last set of pics) I have a cast iron Kohler shower pan that is 36x60", with glass doors (French). I could see you doing something like that in your room. The curb is about 2" finished floor. Easy to get in and out of. The cast iron is a dream to maintain. Even better might be using a 36x48" pan then have 18" to one side for storage, as you can see in East Bathroom pictures, to the left of the tub. The storage could be in the form of pullouts like a pantry, or cabinets with pullouts like mine. They would be deep, so the pullouts would be very helpful for access. If you did cabinets, the lower drawers wouldn't be as deep, to allow for the toilet. The upper ones could be deeper. The plumbing could be housed in that pocket too. I like the idea of moving that closet wall to give you the width you need for the toilet and vanity. My East Bathroom; to demonstrate 6.5' wide room with 27" toilet round bowl, with 18" vanity. The floor tiles are 6x12 to help with floor scale. The pull outs at the tub are not as deep as the 30" tub, due to the toilet in the way, but are great for storage. roughing in: the pullouts, the plumbing is in there too and you can just sort of see the wall mounted tub fixtures. the pullouts come out as far as that door, just to the toilet tank: This toilet is the Toto Promenade in the round bowl. I love this toilet and would recommend it. But I love Nancy's idea of the wall mounted toilet with the tank in the wall. I have a Bidet on it now as you can just slightly see by the toilet lid in the pic above): These second comments relate to the plan where the chimney stays in place: I like the idea of expanding the shower. Here, a Kohler pan 36x48" could work well. One thing I did in my West Bathroom was a long wall niche that allows for a bit more elbow room. Its the only thing I like about having a niche, because they can get bogged down with products and trap water on the shelf, causing mold. I wipe down my shower daily following the showers. Last one to shower gets the honors. Its a quick wipe down of all walls and glass. Floor gets a clean every couple months, if that, depending on the shower load. I haven't had to "clean" my shower in 4 years, because of my daily habit (that I never had before). So glad I adopted this habit, I did not want the ugly mess that my old acrylic shower/tub combo had become. Since your wall is not an out side wall you could put a niche there. I only place 2 bottles of product on that shelf, lol. Any extra go in a basket that sits on the shower floor at the far end. I have a nice clinical shower stool in there too, with a gray seat that matches the floor. Nice to sit once in a while to let the rain shower head run on me. Having your toilet move down into the new expansion would be great. If you could move the wall 18" you could have that left wall become a wall with shallow built in 15" cabinets. Maybe a even a pass through into the closet for some things. It could even have a counter and uppers sort of like a kitchen. My West Bathroom; 5' shower space, with grab bar, niche, Hansgrohe rain shower head and hand held, and Fantech brand exhaust fan with light on the ceiling. The motor is in the attic and split into two locations in the bathroom, on at the shower and the other at the toilet: French doors, allow me to open the whole thing if needed, but I just use one normally: Kohler shower pan, in remodel process. This one has a center drain: Don't forget the exhaust fan, and a gap under your door to allow for make-up air to enter the room so the fan can work at evaluating the moist shower air. Click any photo for enlargement and full view.

Go to the better tile showrooms in your area; they will have plenty of options and sizes for your project. Once you start liking a tile line, it's easy enough to pull the rest of the elements together; but you need to see what's appealing to you in person.

I think you're going to want to take your color cues from the finishes you choose for flooring, cabinets, etc., especially in the bathroom. Once you have those, start pulling paint swatches that coordinate and take you in the direction you want to go. I've seen some lovely and classic looking barn doors done, so I'm sure you can pull off the look. I have seen people caution against using them between bedroom and bath though, as you may have more light and noise leakage that you get with a traditional door.