Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
A pale olive green background with a seamless texture.
Source V. Hartikainen
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Embossed lines and squares with subtle highlights.
Source Alex Parker
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
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
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
Original seamless pattern with an Inkscape filter.
Source Firkin