More in the paper realm, this time with fibers.
Source Jorge Fuentes
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Retro Circles Background 5 No Black
Source GDJ
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Inspired by the B&O Play, I had to make this pattern.
Source Atle Mo
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
A seamless background texture of old cardboard.
Source V. Hartikainen
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Prismatic Geometric Pattern Background 2
Source GDJ
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo