Another special idea here.

In the area I live there are lots of limestone rocks all around, which is soft enough to carve with metal tools and sturdy enough to stand any wind and water corrosion.
The crazy idea that was born in my mind long time ago is carving some mythological creatures like majestic white dragons, graceful unicorns, furious demons and wise nagas from these limestone rocks using such simpliest tools as hammer and chisel.
Of course I'll need several months of practice to produce real characters, but for beginning I can carve something simple and surrealistic, e.g. cubes, pyramids, and other basic shapes.
Perhaps when I develop sufficient carving skills I'll make an online gallery of my limestone creations.