A repeating background with seamless texture of stone. There haven't been any stone-like backgrounds for a while, so I have decided to create one more. The rest can be found in the appropriate category.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Sharp pixel pattern, just like the good old days.
Source Paridhi
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
The classic notebook paper with horizontal stripes.
Source Are Sundnes
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Alternative colour scheme for the original floral pattern.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis