A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This is a remix of "geometrical pattern 01".
Source Yamachem
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Fix and cc0 to get the tile this is based on.
Source SliverKnight
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
White circles connecting on a light gray background.
Source Mark Collins
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective