Minecraft wiki entry for Making_nice_floors, associated text: Requirements: 16 andesite, 9 diorite
This type of floor does not look fancy or polished, but it is great for an old floor that looks like its eroding away. It is basically a floor of andesite with diorite placed randomly throughout. Note that this grid is for a 5 x 5 floor, unlike the others, which were for a 6 x 6.