This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This is the remix of "Strawberry Pattern Background" uploaded by "GDJ". Thanks. I realigned strawberries so as to get seamless and changed the BG color.
Source Yamachem
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Sharp but soft triangles in light shades of gray.
Source Pixeden
Abstract Tiled Background Extended 11
Source GDJ
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
It’s big, it’s gradient—and it’s square.
Source Brankic1979
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
Remixed from a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner