A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
Prismatic Abstract Background Design No Black
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
A free seamless background with pink spots.
Source V. Hartikainen
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Classic vertical lines, in all its subtlety.
Source Cody L
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
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