From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Retro Circles Background 4 No Black
Source GDJ
Green Web Background, Seamless tile.
Source V. Hartikainen
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Tiny, tiny 3D cubes. Reminds me of the good old pattern from k10k.
Source Etienne Rallion
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
Continuing the geometric trend, here is one more.
Source Mike Warner
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin