Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Remixed from a JPG that was uploaded to Pixabay by susanlu4esm
Source Firkin
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
ZeroCC tileable moss texture, photographed and made by me. CC0
Source Sojan Janso
The original has been presented as black on transparent and stored in the pattern definitions. To retrieve the unit tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Colorful Floral Background 3 No Black
Source GDJ
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Classic 45-degree pattern, light version.
Source Luke McDonald
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
The original enhanced with one of Inkscapes's filters.
Source Firkin
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
The following free background pattern has glossy diagonal stripes as a texture to it, and it's colored in a light blue gray color. This background pattern is suitable for using in web design or any other graphic design projects. This applies to all background patterns here.
Source V. Hartikainen