Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Prismatic Curved Diamond Pattern No Background
Source GDJ
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Prismatic Floral Background No Black
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
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
Abstract Tiled Background Extended 8
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Dark blue concrete wall with some small dust spots.
Source Atle Mo
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin