Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Classic 45-degree pattern, light version.
Source Luke McDonald
Zero CC tileable ground cracked, crackled, texture, made by me.
Source Sojan Janso
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
A comeback for you: the popular Escheresque, now in black.
Source Patten
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Formed by distorting an image on Pixabay that was uploaded by gustavorezende. To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
A background tile of dark textile. Made this a long time ago and just now decided to publish it.
Source V. Hartikainen
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
A repeating background with wood/straw like texture.
Source V. Hartikainen
From a drawing in 'Prose and Verse ', William Linton, 1836.
Source Firkin