Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Retro Circles Background 7 No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Prismatic Chevrons Pattern 5 With Background
Source GDJ
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin