The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
A cute x, if you need that sort of thing.
Source Juan Scrocchi
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.
Source V. Hartikainen
Prismatic Floral Background No Black
Source GDJ
A background tile of dark textile. Made this a long time ago and just now decided to publish it.
Source V. Hartikainen
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen