This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
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
Dark blue concrete wall with some small dust spots.
Source Atle Mo
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
A seamless canvas texture for using as background on websites. Colored in pale tones of brown.
Source V. Hartikainen
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić