With respect to:
material granite limestone marble quartzite sandstone slate
finish cleft unfilled/honed filled/honed unfilled/polished filled/polished tumbled cobblestone distressed cobblestone
size any size 10x10cm (4"x4") 15x15cm (6"x6") 15x30cm (6"x12") 20x20cm (8"x8") 20x40cm (8"x16") 25x25cm (10"x10") 30x30cm (12"x12") 30x45cm (12"x18") 30x60cm (12"x24") 40x40cm (16"x16") 40x60cm (16"x24") 45x45cm (18"x18") 60x60cm (24"x24")