A seamless pattern formed from a rectangular tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
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
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Prismatic Triangular Background Design Mark II 5
Source GDJ
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A seamless canvas texture for using as background on websites. Colored in pale tones of brown.
Source V. Hartikainen
A brown metallic grid pattern layered on top of a dark fabric texture. It should look great when using as a tiled background on web pages, especially blogs.
Source V. Hartikainen
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Prismatic Abstract Line Art Pattern Background
Source GDJ
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
The image depicts the Japanese Edo pattern called "seigaiha" or "青海波" meaning "blue -sea- wave".I hope it's suitable for the summer season.
Source Yamachem
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
It looks very nice I think.
Source V. Hartikainen
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin