White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Prismatic Geometric Pattern Background No Black
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
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Original seamless pattern with an Inkscape filter.
Source Firkin
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Have you wondered about how it feels to be buried alive? Here is the pattern for it.
Source Hendrik Lammers
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
This is the remix of "Strawberry Pattern Background" uploaded by "GDJ". Thanks. I realigned strawberries so as to get seamless and changed the BG color.
Source Yamachem
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin