On top of the skirting? No way! I think that would look awful. Far too bulky in a sleek designed room. We have an ensuite which has the wall tiles sitting on top of the floor tiles to give the impression of more of a wet room effect. We also have a main bathroom and in here have the floor tiles cut to the size of the skirting that was originally in there height wise and then placed on top of the floor tiles So one room has nothing and the other room has the floor tiles up the wall as a skirting.

B&Q have some nice patterned floor tiles. Here's a couple I think would go well with white wall tiles.

I wonder whether a darker wood effect tile would work on the floor? Darker wood seems to create a more classy feel whereas the pale wood tiles (which are nice) seem more beachy.

Walls and Floors have these https://www.wallsandfloors.co.uk/white-tiles-white-floor-tiles-15072 https://www.wallsandfloors.co.uk/matt-black-white-floor-tiles-black-floor-tiles-15071