This was formed by distorting an image of a background on Pixabay.
Source Firkin
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Retro Circles Background 5 No Black
Source GDJ
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Sharp but soft triangles in light shades of gray.
Source Pixeden
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin