The classic notebook paper with horizontal stripes.
Source Are Sundnes
Prismatic Triangular Background Design Mark II 5
Source GDJ
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
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
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
A comeback for you: the popular Escheresque, now in black.
Source Patten
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen