An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A background tile of dark textile. Made this a long time ago and just now decided to publish it.
Source V. Hartikainen
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
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
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
This seamless light brown background texture resembles a wallpaper with vertical stripes. One way to use it is as a tiled background on web sites.
Source V. Hartikainen