Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Prismatic Abstract Geometric Background 3
Source GDJ
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless texture of black leather. I think it will look best when used in headers, footers or sidebars.
Source V. Hartikainen
Continuing the geometric trend, here is one more.
Source Mike Warner
Prismatic Hexagonalist Pattern No Background
Source GDJ
A browner version of the original weathered fence texture.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Prismatic Polka Dots 3 No Background
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin