Agreed with Webber Development, 3 different tile selections are perfect adding another will be too much.

I think even the 3 you have now are too many, especially the mosaic [too many variations will detract from hexagonal]... something simpler like...

nice if you have oil-rubbed bronze ? otherwise these browns are dark.

Why not the hex and other throughout, but with some simple designs:

Way too busy already. Skip the tiny mosaic. Please.

This shower will not have a glass door as it is a walk in so not much will be seen from the bathroom itself. The accent mosaic is only going to be 3-4 inch of detail around the shower wall and in the back of the niche, as to not make it to busy, but agreed, it could come off that way.
What do you think of the floor tile below to go with hexagon tile? Too much?

Personally, I do not like the tile. The hexagon tile is modern and the square tile is traditional, they just do not go (in my opinion).

I'd use your wall tile on the floor... in fact- we did in our recent bathroom reno!

Thank you all for the feed back.

Even though this is a pic of a kitchen, this is too busy for me. I guess its just a matter of taste. I don't have a theme to my house, such as modern, traditional, I am going with what I like.

Can 12x24 tile be used for a 6x5 shower floor or is it too large?

The kitchen photo above is busy to me as well, and it's because the countertops and back splash are both bold and up against each other. You should choose what you love, if you love the two tiles together..do it, who cares what I think. I have seen larger tile in a shower, but it needs to have texture to help with traction. Otherwise, smaller is better.

You really can't use a 12X24 on a shower floor because of the slant to the center drain. You need some sort of mosaic, usually no bigger than 2"X2" for the flexibility. If you use a linear drain, you can get away with a larger tile.

I already posted, but I like your 3 just not that the mosaic included was it: 1 or 2 soft neutrals like blue / another might have exact colors as hex.

-- is there a smaller version for shower floor?...

No,there is not a smaller hexagon. I actually returned the hexagon tile and plan on going with a more neutral shower floor that I can use for the bathroom floor as well, but I am having trouble finding the same tile in 2x2 or 2x3 that matches a larger size...