This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo