Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Prismatic Triangular Background Design Mark II 5
Source GDJ
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
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
A gray background pattern with a texture of textile. Suits perfectly for web design.
Source V. Hartikainen
A seamless paper background colored in pale yellow.
Source V. Hartikainen
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
A seamlessly tile-able grunge background image.
Source V. Hartikainen
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin