Refresh the grout if it needs it. Painting the walls above the tile in a white that matches the wall tiles might help brighten and visually enlarge the space. Is that a shelf above the toilet that you could place a trailing indoor plant on? A modern bath mat or rug on the floor with coordinating towels. Are you making improvements for yourself or for selling etc?

Depends largely on what you like - do you like those brown tiles? Personally I'd be spraying over those to lighten the room, but if you like those, spray the walls with whatever colour you're wanting as that will get rid of that little pattern that I suspect is on tiles on other walls as well? Looks like there is a shelf above the loo, so get an interesting plant or find some artwork that you don't mind looking at from the shower! :)

What is your budget and long term plans for the home? It is a neutral space with lots of scope to add nice accessories, even a plant, colourful towels. I prefer a neutral bathroom over a 50's-60's candy pink or baby blue number.

Could you white grout the floor to really lift it and make a feature of it at the same time? Also agree painting the walls white will help, and a frameless shower screen would make it look more modern. Then add greenery as it will offset the floor colour nicely.

Paint the walls of the room white to match the tiles and change the flooring its bringing the room down and making it feel cold. You could go with a laminate floor if you're not wanting to re tile. You will need professional do to this though as waterproofing in bathroom is important. As N.B. interiors said above, replacing the shower screen would make a huge difference but that depends on your budget.

I will put some photos below for inspo

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sorry - this is hopefully the link to the ideabook - http://www.houzz.com.au/ideabooks/7625914/thumbs/g-feb2013

had to switch to a computer

I would leave the walls and just tile over the slate in a modern tile (provided slate is not dummy). Then replace the shower screen and fittings.

Re fresh the grout, paint the wall white, and add some wood elements to enhance the floor. Also add some plants to add life to the room. It has good bones just need some character. Good luck

All of above and a floating shelf rather than that old fashioned painted pine shelf-then add plant etc

What about installing a shower system which includes an acrylic shower base & acrylic wall so no need for tiles at all in the shower area

this is what I did to our old bathroom . The decorative squares were drink coasters that I stuck on the tiles :)

The only thing that is really ugly with this bathroom is the floor tiles and old shower screen. I'm all for getting new shower screen install. Repaint the whole bathroom with tile paint and for the floor get good quality water marine grade merbau timber and put timber decking over the bathroom floor. New shower head and tap fittings if you see fit.

I think you are lucky to have a nice neutral bathroom. I would paint walls white, get new frameless shower screen and regrout tiles if needed. Then add colourful towels and accessories.