Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
The name is totally random, but hey, it sounds good.
Source Atle Mo
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Continuing the geometric trend, here is one more.
Source Mike Warner
Prismatic Groovy Concentric Background 4
Source GDJ
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
A simple bump filter made upon request at irc #inkscape at freenode. Made a screen capture of the making here: https://youtu.be/TGAWYKVLxQw
Source Lazur URH
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A bit strange this one, but nice at the same time.
Source Diogo Silva
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim