Colour version of the original seamless pattern.
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
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Continuing the geometric trend, here is one more.
Source Mike Warner
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow