I went vertical so tall. Helps to raise height. It will also match your 300 floor tiles I have silver grout with antique white tiles. It’s a personal choice you can’t go wrong either way.

Where horizontal and vertical meet should not be grouted because it needs something flexible, something we learned the hard way, twice, in different houses. Make sure your tiler redoes the waterproofing properly too.

If you're wanting to recolour tile do NOT do this yourself. If that's the way you want to go get the pro's in. They do not use paint, they use an acrylic resin and chemically etch the tile before hand. It is applied with a spray gun for a nice finish. It won't last forever but you will probably be satisfied with the results for long enough.

My own personal style would be quite a bit different . I'd keep the shower , because it is gold , its there , it fits . Okay , its dated , and I may consider changing the glass , but I wouldn't take out a wall , a cupboard , a complete new shower and tiles and everything . The tiles , the frieze are okay , the base is dated but I'd live with it . The floor tiles are dated , and I'd change them , but not to the grey ones . The whole room is too white , so I'd go charcoal , in fact I'd try to get a charcoal with offwhite and gold streaks . Then I'd triple down , with gold taps on the vanity , gold handles , gold towel hoop , maybe even go for one of those gold covers for the power point -- just a flat one with chamferred corners , not one with vines and circles ! There you go , white and gold with a darker floor but still some light and gold tones -- done for $1000 or so , plus minimal labour !