This design originally used 8mm round fiber optic beads in black and dark blue (no longer available). A few possible subs are linked in -- maybe sodalite & lapis, or Swarovski crystal pearls in Dark Lapis & Mystic Black? Or your favorite 8mm beads from your bead stash.
Did we mention our favorite part? The Mirage beads change color with temperature changes!
1 strand [use 40] #20-565 Bead, Bamboo Coral, Short Branch