Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
This one is amazing, truly original. Go use it!
Source Viahorizon