The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Prismatic Groovy Concentric Background 4
Source GDJ
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Curved Diamond Pattern 7 No Background
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
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin