A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
Might not be super subtle, but quite original in its form.
Source Alex Smith
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
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
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Seamless Green Tile Background
Source V. Hartikainen
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Prismatic Polyskelion Pattern No Background
Source GDJ
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić