A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
A seamless texture of a rough concrete surface.
Source V. Hartikainen
A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.
Source V. Hartikainen
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
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
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A bit of scratched up grayness. Always good.
Source Dmitry
Another fairly simple design drawn in Paint.net and vectorized in Inkscape.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
Prismatic Hypnotic Pattern No Background
Source GDJ
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Prismatic Abstract Background Design No Black
Source GDJ
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo