Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
A version without colours blended together to give a different look.
Source Firkin
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Abstract Ellipses Background Grayscale
Source GDJ
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
From an image on opengameart.org shared by rubberduck.
Source Firkin
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green