A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Background pattern originally a PNG drawn in Paint.net
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
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
Pattern formed from simple shapes. Black version.
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
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
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard