This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
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
Seamless Green Tile Background
Source V. Hartikainen
Kaleidoscope Prismatic Abstract No Background
Source GDJ
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
This one needs to be used in small areas; you can see it repeat.
Source Luca
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso