Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Retro Circles Background 8 No Black
Source GDJ
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
A white version of the very popular linen pattern.
Source Ant Ekşiler
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Might not be super subtle, but quite original in its form.
Source Alex Smith