A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Black And White Floral Pattern Background from PDP.
Source GDJ
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background No Black
Source GDJ
Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Retro Circles Background 4 No Black
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
Tiny circle waves, almost like the ocean.
Source Sagive
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin