I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
More bright luxury. This is a bit larger than fancy deboss, and with a bit more noise.
Source Viszt Péter
This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Prismatic Geometric Pattern Background 2
Source GDJ
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous