I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
An alternative colour scheme to the original seamless pattern.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Prismatic Abstract Geometric Background 4
Source GDJ
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
As simple and subtle as it gets. But sometimes that’s just what you want.
Source Designova
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell