From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The image is the remix of "wire-mesh fence seamless pattern" .This is a more minute version of it.Sorry for the file size.Using path>difference in Inkscape, I will cut out any silhouette from this pattern and create a "meshed silhouette".
Source Yamachem
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Psychedelic Geometric Background No Black
Source GDJ
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Green Web Background, Seamless tile.
Source V. Hartikainen