Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Pattern formed from simple shapes. Black version.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
This is the remix of "Tileable Wave Pattern 2" uploaded by "Arvin61r58".Thanks.I added a wire-mesh fence seamless pattern as a lower layer.
Source Yamachem
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Remixed from a drawing in 'An Index to Deering's Nottinghamia Vetus et Nova', Rupert Chicken, 1899. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
Zero CC tileable grass texture, photographed and made by me. CC0
Source Sojan Janso
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus