A seamless texture of a rough concrete surface.
Source V. Hartikainen
Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Inspired by this, I came up with this pattern. Madness!
Source Atle Mo
Run a restaurant blog? Here you go. Done.
Source Andrijana Jarnjak
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Gold Triangular Seamless Pattern No Background
Source GDJ
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Classic 45-degree pattern, light version.
Source Luke McDonald
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968