Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Original seamless pattern with an Inkscape filter.
Source Firkin
Prismatic Groovy Concentric Background
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
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
The image depicts a tiled seamless pattern.The tile represents four leaves aligned every 90 ° , which may look like a bird or a dragon .The original leaf design is from a Japanese old book.
Source Yamachem
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
This one needs to be used in small areas; you can see it repeat.
Source Luca
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4
Source GDJ
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz