Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Colour version of the original seamless pattern.
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A version without colours blended together to give a different look.
Source Firkin
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
If you want png files of thisu can download them here :
Source Viscious-Speed
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin