This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Prismatic Geometric Pattern Background 2
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
A seamless background of warped stripes on paper.
Source V. Hartikainen
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin