Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Might not be super subtle, but quite original in its form.
Source Alex Smith
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
Run a restaurant blog? Here you go. Done.
Source Andrijana Jarnjak
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
An alternative colour scheme to the original seamless pattern.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Actually, there's no clouds in it, but I think it looks quite nice.
Source V. Hartikainen
Prismatic Groovy Concentric Background 2
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin