Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Prismatic Geometric Pattern Background
Source GDJ
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a drawing in 'Incidents on a Journey through Nubia to Darfoor', F. Ensor, 1891.
Source Firkin
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
This tiled background comes in red and consists of tiles that look like gemstones. It is more for blogs or social profiles, I think.
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Prismatic Groovy Concentric Background No Black
Source GDJ