Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Background formed from the original with an emboss effect
Source GDJ
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use 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
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
This one needs to be used in small areas; you can see it repeat.
Source Luca
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin