Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Retro Circles Background 5 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
Prismatic Groovy Concentric Background 4
Source GDJ
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Prismatic Abstract Background Design
Source GDJ
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
Almost like little fish shells, or dragon skin.
Source Graphiste
Black And White Floral Pattern Background from PDP.
Source GDJ
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A free pink background pattern.
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A bit strange this one, but nice at the same time.
Source Diogo Silva