A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
The image depicts polka dot seamless pattern.
Source Yamachem
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin