Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Colour version of the original seamless pattern.
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Embossed lines and squares with subtle highlights.
Source Alex Parker
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This one has rusty dark brown texture.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor