A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Geometric triangles seem to be quite hot these days.
Source Pixeden
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
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
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
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