Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Prismatic Isometric Cube Extra Pattern No Background
Source GDJ
A free background pattern with abstract green tiles.
Source V. Hartikainen
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
This is a seamless pattern which is derived from a flower petal image.
Source Yamachem
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin