The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
8 by 8 pixels, and just what the title says.
Source pixilated
Black brick wall pattern. Brick your site up!
Source Alex Parker
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
Prismatic Polka Dots 3 No Background
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.
Source V. Hartikainen
A new take on the black linen pattern. Softer this time.
Source Atle Mo
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
Prismatic Basic Pattern 2 No Background
Source GDJ
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin