To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
From a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
Continuing the geometric trend, here is one more.
Source Mike Warner
Geometric triangles seem to be quite hot these days.
Source Pixeden
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
This could be a hippy vintage wallpaper.
Source Tileable Patterns