Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Abstract Tiled Background Extended 6
Source GDJ
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Classic 45-degree pattern, light version.
Source Luke McDonald
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
This was formed by distorting an image of a background on Pixabay.
Source Firkin
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
More in the paper realm, this time with fibers.
Source Jorge Fuentes
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
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
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Prismatic Geometric Pattern Background 2
Source GDJ
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin