I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Black brick wall pattern. Brick your site up!
Source Alex Parker
Fix and cc0 to get the tile this is based on.
Source SliverKnight
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
Alternative colour scheme. 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
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Prismatic Basic Pattern 2 No Background
Source GDJ
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin