Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
More in the paper realm, this time with fibers.
Source Jorge Fuentes
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Curved Diamond Pattern No Background
Source GDJ
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen