Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Original minus the background
Source Firkin
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
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
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A brown metallic grid pattern layered on top of a dark fabric texture. It should look great when using as a tiled background on web pages, especially blogs.
Source V. Hartikainen
"Beige Stone", Tileable Texture.
Source V. Hartikainen
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel