CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
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
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Geometric triangles seem to be quite hot these days.
Source Pixeden
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
From a drawing in 'Worsborough; its historical associations and rural attractions', Joseph Wilkinson, 1879.
Source Firkin
A seamless background of warped stripes on paper.
Source V. Hartikainen
An alternative colour scheme to the original seamless pattern.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Plywood Web Background background image for use in web design.
Source V. Hartikainen
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
A version without colours blended together to give a different look.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin