I got my wife a custom cake from Bittersweet Bakery a few weeks ago. I don't know what they can do in the way of shapes - the one I got was round. I do know, however, that it was among the best cakes I have ever eaten: perfect level of moistness, frosting with out-of-this-world taste, etc. As for shapes, I walked by Alliance Bakery the other day and they had some unbelievable cakes shaped like fashionable handbags in their window. Based on a quick perusal of
pictures they've posted on Flickr, I'm sure they can do a dinosaur. I can't vouch for the taste of their cakes, though.
Bittersweet Pastry Shop & Cafe
www.bittersweetpastry.com1114 W Belmont Ave
Chicago, IL 60657
(773) 929-1100
Alliance Bakery - Bakery
www.alliance-bakery.com1736 W. Division
Chicago, IL 60622
(773) 278-0366