The Colored Stones are an easter egg found in Survival 404. There are seven of them, one for each color of the basic rainbow (RIYBGOV). When all seven are crafted together into a tool, they create The Rainbow Boat, the fastest vehicle in the game. They only appear once, and never again. It's best to have a team in order to get them all. They only spawn once at each server. Many people use the 'double craft' method to make more than one rainbow galleon.