Near the University of Pennsylvania, there is a bakery called Artisserie Chocolate Cafe. Recently I went there, and while I wouldn't say my socks were knocked off, I thought their pastry work was solid--if you find yourself in the neighborhood, you'll be able to find something tasty.
However, the main reason I'm posting is that I did think it was worthwhile to show you some pictures of their pretty presentation. See the chocolate-lined cold hot chocolate, above; also, these fun Mondrian-inspired chocolate truffles:
So if you're in the 'hood, check them out--they have a variety of pastries and baked goods, too!
Artisserie Chocolate Cafe, 3421 Walnut St, Philadelphia, PA 19104. Online here.