Check out these great wallpaper patterns from Ballard Designs. I stumbled upon these while perusing their website. They're sold in double rolls and are very reasonably priced. My favorite? The Neoclassical Toile, shown below along with more of Ballard's stylish patterns.
Cane, $119 and Vintage Frame, $59
Floral Damask and Antiqued Harlequin, both $59
Mantova Stripe, $119 Oriental Java, $119
Green Trellis and Corsica Paisley, both $119