Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Green Background Pattern
Source V. Hartikainen
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
A free seamless background pattern for use on websites.
Source V. Hartikainen
A version without colours blended together to give a different look.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
Prismatic Groovy Concentric Background 5
Source GDJ
A seamless background pattern of dark brown wood planks.
Source V. Hartikainen
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
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
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Remixed from a drawing that was uploaded to Pixabay by captenpub.
Source Firkin
This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady