The starting point for this was drawn on the web site steamcoded.org/PolyskelionMaker.svg
Source Firkin
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Prismatic Groovy Concentric Background 5
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
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
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin