The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Prismatic Abstract Background Design No Black
Source GDJ
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
A white version of the very popular linen pattern.
Source Ant Ekşiler
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin