A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Prismatic Groovy Concentric Background No Black
Source GDJ
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
Prismatic Hexagonalist Pattern No Background
Source GDJ
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
A seamless texture of worn out "cardboard".
Source V. Hartikainen
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
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
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek