Might not be super subtle, but quite original in its form.
Source Alex Smith
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Abstract Geometric Background 5
Source GDJ
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
This one is amazing, truly original. Go use it!
Source Viahorizon
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
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