A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Alternative colour scheme. 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
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
White circles connecting on a light gray background.
Source Mark Collins
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Pattern formed from simple shapes. Black version.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
From an image on opengameart.org shared by rubberduck.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Formed by distorting an image on Pixabay that was uploaded by gustavorezende. To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin