Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Background formed from the original with an emboss effect
Source GDJ
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Prismatic Hexagonalist Pattern No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop