People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Green Background Pattern
Source V. Hartikainen
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
Old China with a modern twist, take two.
Source Adam Charlts
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Prismatic Groovy Concentric Background 3
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
You know you love wood patterns, so here’s one more.
Source Richard Tabor
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Prismatic Groovy Concentric Background 5
Source GDJ
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'La Principauté de Liège et les Pays-Bas au XVIe siècle', Société des Bibliophiles Liégeois ,1887.
Source Firkin