This was formed by distorting an image of a background on Pixabay.
Source Firkin
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
A seamless web texture of "green stone".
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Fix and cc0 to get the tile this is based on.
Source SliverKnight
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
Black brick wall pattern. Brick your site up!
Source Alex Parker
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso