Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
A free background image with a seamless texture of cardboard. This texture of cardboard looks quite realistic, especially when is actually tiled.
Source V. Hartikainen
Spice up your next school project with this icon background.
Source Swetha
This was formed by distorting an image of a background on Pixabay.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A comeback for you: the popular Escheresque, now in black.
Source Patten
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
Geometric triangles seem to be quite hot these days.
Source Pixeden
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
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
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
From a drawing in 'Royal Ramsgate', James Simson, 1897.
Source Firkin