Lovely pattern with some good-looking non-random noise lines.
Source Zucx
A comeback for you: the popular Escheresque, now in black.
Source Patten
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
An abstract Background pattern of purple twisty patterns.
Source TikiGiki
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
A seamless texture of a rough concrete surface.
Source V. Hartikainen
A bit of scratched up grayness. Always good.
Source Dmitry
Prismatic Geometric Pattern Background
Source GDJ
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Sharp but soft triangles in light shades of gray.
Source Pixeden
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin