I did end up making an owl from my final pre-painted rock leftover from our Cub Scout Geology Night.
Materials: rock (primed with gesso, then painted brown), brown felt, orange felt, googly eyes
Cut the brown felt into a matching pair of teardrops and adhere them on the sides of the rock. Glue the eyes in place, then add a small triangle beak. Cut talons and add them at the bottom. Done!