This one needs to be used in small areas; you can see it repeat.
Source Luca
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
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
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Abstract Ellipses Background Grayscale
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Someone was asking about how to achieve a fur pattern at #inkscape irc so tried to make a filter on it. Flood filled fractal noises rigged together. May someone find a good use for these.
Source Lazur URH
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Sometimes you just need the simplest thing.
Source Fabricio
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
The tile this is based on was adapted from an image that was uploaded to Pixabay by frolicsomepl. It can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim