Thoroughbreds, just like other horses, are graceful in their own way. Personally, I belive that thoroughbreds, along with morgans, are one of the most graceful, beautiful, and spirited horse breeds ever. But, of course, it does depend upon your preferences of horses. Here are a few pictures/information of thoroughbreds
http://horses.about.com/od/breeds/p/thoroughbred.htm
http://www.thesavvyhorse.com/2imgyoungstallion.jpg
http://www.westpointtb.com/site-imagesbanner_about.jpg
http://www.cfgphoto.com/data/media/366CFG7089.jpg