A free grid paper background pattern for using on web sites.
Source V. Hartikainen
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Lovely pattern with splattered vintage speckles.
Source David Pomfret
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin