Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Almost like little fish shells, or dragon skin.
Source Graphiste
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
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
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
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
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
A seamless background texture of old cardboard.
Source V. Hartikainen
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Prismatic Groovy Concentric Background 2
Source GDJ
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
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
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor