Might not be super subtle, but quite original in its form.
Source Alex Smith
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Paper-Wallpaper. CC0 License.
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Neat little photography icon pattern.
Source Hossam Elbialy
Gamedev - Metal Textures. CC0 License.
Source Davit Masia
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
CC0 for Free, hope you like it.
The name Paisley reminds me of an old British servant. That’s just me.
Sharp pixel pattern looking like some sort of fabric.
rug texture background
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Retro Squares Background 9
Incoming catena. Stone & well. CC0 texture.
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Prismatic Dots Background 3
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
From a drawing in 'Royal Ramsgate', James Simson, 1897.
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I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
The name is totally random, but hey, it sounds good.
Source Atle Mo
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
8 frame film strip with the pictures left blank
From an image on opengameart.org shared by rubberduck.
*** Released Now !! ***Download
Prismatic Dots Background 5