This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
An alternative colour scheme to the original seamless pattern.
Source Firkin
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
A version without colours blended together to give a different look.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
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
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
Retro Circles Background 4 No Black
Source GDJ
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A seamless tessellation pattern. To get the tile this is formed from, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin