The Colour of your paving is an important choice in helping make your decision on the paving that is right for you.
Some people prefer to keep things very co-ordinated,
whilst some prefer to create a striking contrast of colours using borders.
For Natural Stone, you can specify a range in the colour you are wanting, but if you want to be more exact; then a manmade option would be better, such as Porcelain.
This is because Natural stone can change when it comes out of the ground. It's important to note that dark limestones especially, can often lighten over time.