From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
A seamless pattern formed from a rectangular tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
A free pink background pattern.
Source V. Hartikainen
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
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
Retro Circles Background 5 No Black
Source GDJ
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
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
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.