This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
It’s big, it’s gradient—and it’s square.
Source Brankic1979
You guessed it – looks a bit like cloth.
Source Peax Webdesign
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Green Background Pattern
Source V. Hartikainen
Neat little photography icon pattern.
Source Hossam Elbialy
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
A seamless background of warped stripes on paper.
Source V. Hartikainen
From a drawing in 'A Guide to the Guildhall of the City of London', John Baddeley, 1898.
Source Firkin
An alternative colour scheme to the original seamless pattern.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza