To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Abstract Tiled Background Extended 6
Source GDJ
Kaleidoscope Prismatic Abstract No Background
Source GDJ
To celebrate the new feature, we need some sparkling diamonds.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Continuing the geometric trend, here is one more.
Source Mike Warner
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin