I agree that the Paphs have some of the nicest leaves for patterns. This is my Paph delenatii, var Dunkel x sib. The leaves are a dark purple on the underside, too, which is really cool. I bought this orchid solely for the leaves as I am not a real fan of the flowers (I have tried to fall in love with them before....).
Another nice pattern for leaves, if you have a terrarium, is the Lepanthes calodictyon.
I decorate in green!