Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Prismatic Floral Background No Black
Source GDJ
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
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 comeback for you: the popular Escheresque, now in black.
Source Patten