Inspired by a pattern found in 'A General History of Hampshire, or the County of Southampton, including the Isle of Wight', Bernard Woodwood, 1861
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A new one called white wall, not by me this time.
Source Yuji Honzawa
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
From an image on opengameart.org shared by rubberduck.
Source Firkin
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
One more sharp little tile for you. Subtle circles this time.
Source Blunia
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin