First, the bathroom floor...if you want hex tiles, the only reason you might not be able to use them is if you are planning on using a membrane like Ditra under the tile. Ditra, due to the nature of it's structure, limits tile to a minimum of 2". If you're going over cement board or another smooth-surface tile backer board on your floor, you can use small hex tiles. Simply ask him what his no kidding objections are to the hex tiles. There may be a real world reason why they are too small (like over Ditra) or he simply may not like working with mosaics. Find out why. For the shower floor, I usually stick to 4" or smaller, that way there are grout lines underfoot for traction. Plus smaller tile conform to the slopes of the pan without requiring cut lines at the intersections of the slopes in the pan. 2" squares are probably most common. Some people like the flat stone or pebble mosaic, but if you suffer from grout-phobia, the irregular spacing on those might scare you away. If there is a trend these days, it's toward large format tiles. They can lead you towards a contemporary design, but they can fit other styles as well. If I can steer you towards anything, look at "topical waterproofing membranes" for waterproofing your shower. Topical membranes put the waterproofing between the tile and the tile backer board, so the tile get adhered right to the membrane. It's a better way to control moisture within a shower. Two of the more common trowel or roll-on membranes are Hydroban and RedGard, for sheet membranes, Kerdi is probably the most common one. Probably the best, and easiest way to waterproof a shower these days is with a Laticrete flanged drain and Hydroban. You can wade through youtube videos or visit Laticrete's website to see what that is all about. Remember...unless you are planning on selling, I'll caution you to use tile sizes and patterns that you like, that meet the style of your house. Don't design for the latest fad, unless it's something that you really prefer. If you have trouble defining the tile size, pattern, or style that you do like, it can sometimes help to go to a site like houzz and look over bathroom photos there.

That shower curtain is pretty intense. Are you sure you want to keep it? It's just a little "precious" for older girls with that much pink, IMHO. The only color that I think could stand up to it with older girls would be a pretty bright orange, and try for a Morroccan casbah look with even more pattern and color and brass hanging lanterns and screens. Layer a cobalt blue curtain under the pink and use some metallic chains for the tieback for the pink curtain. Paint the ceiling turquoise. You can get some talavera or Turkish tiles on Ebay and frame them for an accent. If you have a drop in sink, you could replace it with a talavera one. They aren't that expensive and give lots of style. Cobalt blue bath accessories and rug with other hints of turquoise and pink here and there and it would be fab. As an alternqative, I could definately see doing a fun apple green and white bathroom, but not with that curtain. For green and white, use the chair rail/wainscoating approach and put the green below with white above. A fresh gingham check or ticking stripe for the shower curtain and add in more color with different shades of green towels. A dark green rug and various green accessories would complete the look.

I think consistency is important, especially in a small space. If most of the finishes are chrome (what's your hardware on the vanity, by the way?), by installing a light or lights that are ORB, you are drawing attention to them and you might want to think about that. Seems like from what I've seen on the shows where people are fixing up to sell, keeping things neutral is a good way to go. And just because you can see the two lights from the LR, doesn't mean they should match; the lav and the LR are very distinct spaces, after all. If you feel its too cold in there with all chrome, perhaps warm up the space with a nice pop of color in your hand towel, mat on the floor if you are so inclined, or other small accessory. Good luck!

I would find a good wallpaper installer to do a continuation lay of a wallpaper mural. Some have a bit of your bedroom blue with the greens. The effect with the lighter sky at the top will add more vertical height and look cool. Maybe not those particular mural wallpapers ( just quickly grabbed some) but there are some nifty wallpaper murals out there. Google bathroom wallpaper murals or scenery wall murals, A bunch of trees with water and sky would work so well with the floor color, countertop and wood of vanity... greens, blues, a bit of brown, earth with everything getting lighter as it goes up. Small off areas can be painted any color in the mural.