A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Prismatic Geometric Pattern Background 2
Source GDJ
Psychedelic Geometric Background No Black
Source GDJ
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso