Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Tiny circle waves, almost like the ocean.
Source Sagive
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker