Here are some popular stone choices:
Granite - Granite has a wide range of options and has the option to be flamed for slip-resistance.
Limestone - Limestone has a natural, earthy appearance. It is formed from sedimentary materials, such as coral and shells. Since limestone is made with sedimentary material, even when cut from the same slab, tiles can vary is color.
Marble - Marble is a porous stone and is usually used for formal venues. Unfortunately, from Marble's porous nature, it can easily scratch. Marble comes in many different colors and vary in hardness.
Slate - Slate gives your room a very rustic look. It is available in irregular shaped pieces and is usually a dark gray, light red or green color.