A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Remixed from a drawing that was uploaded to Pixabay by DavidZydd
Source Firkin
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
Remixed from a drawing in 'Prehistoric Man: researches into the origin of civilisation in the old and the new world', Daniel Wilson, 1876.
Source Firkin
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa