The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
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
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
You may use it as is, or modify it as you like.
Source V. Hartikainen
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Prismatic Polka Dots Mark II No Background
Source GDJ
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
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
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin