I have learnt a good lesson when it comes to tiles, picking what I loved for the ensuite floor rather then thinking at all about practicalities. I loved the idea of dark grey but have since learnt that they show every water mark, and bit of dust within hours of cleaning them.
Knowing this when it came to choosing tiles for our new family bathroom some months later, we chose a lighter grey which also has texture and slight metallic shine. Not only do they look great but in what is a very high traffic bathroom compared to the ensuite, actually manage to hide dirt very well. This is especially good with two young children who love to play with water in the sink whenever I am not watching closely.