To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
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
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
An alternative colour scheme for the original background.
Source Firkin
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
From an image on opengameart.org shared by rubberduck.
Source Firkin
Prismatic Polyskelion Pattern No Background
Source GDJ
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Alternative colour scheme to the original.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman