Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
Prismatic Polka Dots 3 No Background
Source GDJ
Fix side and a seamless pattern formed from circles.
Source SliverKnight
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
The image is a seamless pattern of a fishnet.
Source Yamachem
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ