Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
White handmade paper pattern with small bumps.
Source Marquis
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo