This was formed by distorting an image of a background on Pixabay.
Source Firkin
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Prismatic Groovy Concentric Background 3 No Black
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
A bit of scratched up grayness. Always good.
Source Dmitry
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Prismatic Abstract Line Art Pattern Background 2
Source GDJ