I hate it when Nintendo sticks stuff in the games that seems important but actually has little meaning (like this and that Scorched Slab? thing in R/S/E.) But it's sort of cool, since we get to freely interpret the meanings for ourselves! Originally, I thought the patterns formed a symbol or something. Well, maybe it's a message from the Clefairy family, Deoxys, or Pokemon of other planets! Similar to how crop circles, etc. are sometimes attributed to aliens...