A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
The original enhanced with some gradients.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
From an image on opengameart.org shared by rubberduck.
Source Firkin
Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Prismatic Abstract Geometric Background 5
Source GDJ
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin