Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Geometric triangles seem to be quite hot these days.
Source Pixeden
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Abstract Geometric Background 5
Source GDJ
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Prismatic Polyskelion Pattern No Background
Source GDJ