Same classic 45-degree pattern, dark version.
Source Luke McDonald
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Derived from a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
Continuing the geometric trend, here is one more.
Source Mike Warner
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
White circles connecting on a light gray background.
Source Mark Collins
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Groovy Concentric Background No Black
Source GDJ
From a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
This one needs to be used in small areas; you can see it repeat.
Source Luca
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
A seamless web background with texture of aged grid paper.
Source V. Hartikainen