Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
You know you love wood patterns, so here’s one more.
Source Richard Tabor
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
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Background formed from the original with an emboss effect.
Source Firkin
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
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
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Abstract Tiled Background Extended 8
Source GDJ
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
A free grid paper background pattern for using on web sites.
Source V. Hartikainen