From a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Retro Circles Background 5 No Black
Source GDJ
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Zero CC tillable hard cover red book with X shape marks. Scanned and made by me.
Source Sojan Janso
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
A seamlessly tile-able grunge background image.
Source V. Hartikainen
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
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