This was formed by distorting an image of a background on Pixabay.
Source Firkin
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
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
The base gradient edited so now more details are rendered.
Source Lazur URH
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Colourful background achieved with gradient fills.
Source Firkin
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A free pink background pattern.
Source V. Hartikainen
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin