From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
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
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
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A free seamless background pattern for use on websites.
Source V. Hartikainen
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
Otis Ray Redding was an American soul singer-songwriter, record producer, arranger, and talent scout. So you know.
Source Thomas Myrman
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
Neat little photography icon pattern.
Source Hossam Elbialy
Prismatic Groovy Concentric Background 4
Source GDJ
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Prismatic Curved Diamond Pattern No Background
Source GDJ
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A dark metal plate with an embossed grid pattern and a bit of rust. Here's a dark metal plate texture for use as a tiled background on web pages.
Source V. Hartikainen
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß