Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
This one needs to be used in small areas; you can see it repeat.
Source Luca
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
A seamless web texture of "green stone".
Source V. Hartikainen
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
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
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo