CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Just a nice looking textured pattern with faded blue stripes. Well, that's it for today... one background a day, as usual.
Source V. Hartikainen
The image depicts a seamless pattern of the design which includes a stylized lotus and a stylized crane.I referred to the original image in a book which is into public domain.
Source Yamachem
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Prismatic Abstract Background Design
Source GDJ
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Fix side and a seamless pattern formed from circles.
Source SliverKnight
I love cream! 50x50px and lovely in all the good ways.
Source Thomas Myrman
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen