This is a hot one. Small, sharp and unique.
Source GraphicsWall
Retro Circles Background 8 No Black
Source GDJ
Green Background Pattern
Source V. Hartikainen
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
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
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Prismatic Groovy Concentric Background 2
Source GDJ
Seamless Green Tile Background
Source V. Hartikainen
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Black paper texture, based on two different images.
Source Atle Mo
Based from Design Kindle
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
From a drawing in 'Prose and Verse ', William Linton, 1836.
Source Firkin
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive