Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Green Web Background, Seamless tile.
Source V. Hartikainen
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
A version without colours blended together to give a different look.
Source Firkin
A browner version of the original weathered fence texture.
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica