A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
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
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The original enhanced with some gradients.
Source Firkin
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ