Might not be super subtle, but quite original in its form.
Source Alex Smith
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib