Dark blue concrete wall with some small dust spots.
Source Atle Mo
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Black And White Floral Pattern Background Inverse
Source GDJ
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo