Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Prismatic Abstract Background Design
Source GDJ