Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
A version without colours blended together to give a different look.
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A new one called white wall, not by me this time.
Source Yuji Honzawa
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
This one is amazing, truly original. Go use it!
Source Viahorizon
Seamless Background For Websites. It has a texture similar to cork-board.
Source V. Hartikainen
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ