What did the graces do?

The Graces were goddesses of beauty, creativity and fertility. In descending order, they were called Agleae, Euphrosyne and Thalia. Some say that they were the daughters of Zeus and Eurynome, others said they were daughters of Dionysus and Aphrodite, yet others say HeliOS and Aegle. The Graces are often associated with the Eleusinian Mysteries and the Underworld of Greek Mythology. To them, the river near Delphi, Cephissus, was sacred.

Basically, they were in charge of making things beautiful, not always in an obvious or exterior way. Also, they helped human creativity so mankind learned what natural objects could be used for what purposes.