I'm a big Calvino fan and can thoroughly recommend Cosmicomics as a great collection of shorts. If you enjoy Calvino you may also enjoy Labyrinths by Jorge Luis Borges.
Funny enough I bought Ficciones by Borges at the same time and will read it next.
Calvino is one of my favorite writers. Let me recommend also: The castle of crossed destinies (the book that got me into tarots)