This notecard box set from the Philadelphia Museum of Art features 5 of Degas' charming paintings of ballet Dancers. 

Edgar Degas (French, 1834-1917).
Ten blank 5" x 7" note cards with
envelopes. Two each of the following five
images:

Green Dancers, c. 1885

The Rehearsal, c. 1873-78

The Ballet Class, c. 1878-80

Orchestra Musicians, c. 1870-71

The Dance Class, c. 1874