CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
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
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The tile for this is based on a repeating unit close to a design on Pixabay. It can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Background formed from the original with an emboss effect
Source GDJ
Prismatic Groovy Concentric Background 5
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