A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern formed from background pattern 102
Source Firkin
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Prismatic Basic Pattern 2 No Background
Source GDJ
A seamless pattern formed from background pattern 102
Source Firkin
Prismatic Triangular Background Design Mark II 5
Source GDJ
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Colorful Floral Background No Black
Source GDJ
A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Might not be super subtle, but quite original in its form.
Source Alex Smith
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
The Grid. A digital frontier. I tried to picture clusters of information as they traveled through the computer.
Source Haris Šumić
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
A dark striped seamless pattern suitable for use as a background on websites.
Source V. Hartikainen