Thanks :) Yeah decided to go with tile. So sand cement is ok over existing tiles if I prep them first? Only problem is, the new pad can only be about 30mm at it's thickest (leaving up to 15mm for tiles) otherwise it'll end up being higher than the hallway floor. So I either need to make the fall shallower or not bother with the waste and make it all level. If I made it level, could I use levelling compound at that thickness or would deck mud/sand cement be the best option? Also, should I be putting in mesh for strength? (I know I should (and will) ask the local hardware what they suggest, but it's great to have suggestions from the Houzz community also)

Sorry for the delay....well I still haven't quite got to the floor yet. I have friends and family advising that black would show up every bit of dust etc and one friend who had a shiny black floor and felt that she was forever mopping, and if the light shone on the floor on the wrong angle you could see where the mop had been. I think this would frustrate me too much especially with young children and a cat so I think a whitewash look could be a good option, or reclaimed battered timber perhaps.......see why I haven't chosen the floor yet. Lol. You could always go a black but a weathered matt reclaimed timber that could look good too. Good luck!

This new timber wall product is cute dog approved! It completely transforms the space! Check out the before and after pics. Project by Floortago

My inclination is something with colour and with a connection to elements already in the room. A dark timber frame and a deep coloured strong image, wide enough to link across the chairs and not seem squeezed between them. Here's a random red-toned image from the internet that I have stretched into a dark wood frame. The hues link to the cushions without matching tightly and add richness and warmth.