People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
A white version of the very popular linen pattern.
Source Ant Ekşiler
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton