AGATE is a crystalline canvas, a tie-dyed rock daubed with a paint-soaked
TOWEL and fine brushes, streaked with squeezed and shaken
SPURTs of colors from tubes and buckets. Even rock need not be mere bland
GROUT or gravel when in the hands of a Master Artist.
See more at Notes by Steven.
I love ones like this that are a rush of rich words adding up to a strong impression.