Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Prismatic Hexagonalism Pattern No Background
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Classic vertical lines, in all its subtlety.
Source Cody L
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
From a drawing in 'Worsborough; its historical associations and rural attractions', Joseph Wilkinson, 1879.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen