In a post dated December 28, 2011 over at the blog Flyer Design Goodness, the author has photos of a number of well-designed playing cards and playing card boxes.
One of the brands, Monarchs by the U.S. Playing Card Company, really struck me because of the heraldic themes on both the boxes
and the backs of the playing cards themselves.
All of the designs for the various brands are elegantly done, but these two particularly jumped out for me because of their heraldic elements.
You can see the entire post, and the other playing card designs, at http://flyergoodness.blogspot.com/2011/12/elegant-graphic-design-of-theory11.html
And you can buy packs of any of the cards shown in the Flyer Design Goodness blog post, as well as a number of others, including this one with an heraldic design on the box,
from Theory11 at http://www.theory11.com/playingcards/