CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
"Beige Stone", Tileable Texture.
Source V. Hartikainen
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
From an image on opengameart.org shared by rubberduck.
Source Firkin
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis