I like the top right picture where the grey floor tile appears to run up the wall. But the floor tile looks lighter than the wall, is it a different tile? I would pick a lighter shade from the Kalala Shan as the 2nd tile. Does the tile shop have a contrasting colour from the same family of tiles? Not sure I would go 2 different textures, unless one was really flat and non descript to contrast with textured one that would be the stand out feature. Great colour choices though. And would look lovely coming off the spotted gum floors too!

That is a hard one with those tiles. I would have to think if you did a white, it would kind of work with the colour of your tiles. At the end of the day, they do need to be replaces, but as you said, due to budgeting reasons, you cannot, I can pass on this photo of a nice bathroom with those tiles for you though for inspiration... : )

Most of your look book bathrooms have sandy looks with only a few marble. You may need to pick up some of the colours in the wall tiles for the floor ie cream, white, bluey, grey. Can you post a pic?

Mid century modern...there are just so many wonderful bathroom tile/vanities out there. You could incorporate a vanity in the same wood stain as your wooden floor. With a wonderful coloured or patterned tile.