This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Tiny circle waves, almost like the ocean.
Source Sagive
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
A repeating background with wood/straw like texture.
Source V. Hartikainen
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Prismatic Groovy Concentric Background No Black
Source GDJ
Prismatic Hypnotic Pattern No Background
Source GDJ
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Might not be super subtle, but quite original in its form.
Source Alex Smith
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ