Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
A browner version of the original weathered fence texture.
Source Firkin
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Prismatic Geometric Pattern Background 2
Source GDJ
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
A free background pattern with abstract green tiles.
Source V. Hartikainen
A comeback for you: the popular Escheresque, now in black.
Source Patten
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
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
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo