Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Basic Pattern 2 No Background
Source GDJ
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Prismatic Abstract Geometric Background 4
Source GDJ
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Psychedelic Geometric Background No Black
Source GDJ
There are many carbon patterns, but this one is tiny.
Source Designova
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868.
Source Firkin
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Prismatic Groovy Concentric Background No Black
Source GDJ
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
This one is amazing, truly original. Go use it!
Source Viahorizon
A floral background formed from numerous clones of flower 117.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This light yellow background pattern consists of an irregular pattern of spots. Here's a light background pattern with yellowish tint.
Source V. Hartikainen
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen