Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
A seamless texture of worn out "cardboard".
Source V. Hartikainen
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
From a drawing in 'Heroes of North African Discovery', Nancy Meugens, 1894.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
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
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
An aged paper background tile with smeared and pressed text.
Source V. Hartikainen
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
A white version of the very popular linen pattern.
Source Ant Ekşiler
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski