CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Prismatic Triangular Background Design Mark II 5
Source GDJ
Prismatic Abstract Geometric Background 2
Source GDJ
Subtle scratches on a light gray background.
Source Andrey Ovcharov
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Background pattern originally a PNG drawn in Paint.net
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Prismatic Basic Pattern 2 No Background
Source GDJ
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk