A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Sort of reminds me of those old house wallpapers.
Source Tish
A free seamless background with pink spots.
Source V. Hartikainen
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward