People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A bit strange this one, but nice at the same time.
Source Diogo Silva
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Psychedelic Geometric Background No Black
Source GDJ
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
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
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin