You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
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
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Derived from a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
A background pattern with a look of rough fabric.
Source V. Hartikainen
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav