Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
A pale yellow background pattern with vertical stripes. The stripes are partially faded. I think this background image turned out pretty well, especially those faded stripes.
Source V. Hartikainen
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
A version without colours blended together to give a different look.
Source Firkin
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
More in the paper realm, this time with fibers.
Source Jorge Fuentes
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning