A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
From a drawing in 'Worsborough; its historical associations and rural attractions', Joseph Wilkinson, 1879.
Source Firkin
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
This is sort of fresh, but still feels a bit old school.
Source Martuchox
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Retro Circles Background 8 No Black
Source GDJ
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
White circles connecting on a light gray background.
Source Mark Collins
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin