Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry