Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Seamless Olive Green Web Background Image
Source V. Hartikainen
A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Colourful background achieved with gradient fills.
Source Firkin
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Gold Triangular Seamless Pattern No Background
Source GDJ
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica