A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
The original enhanced with one of Inkscapes's filters.
Source Firkin
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
From a drawing in 'Two Women in the Klondike', Mary Hitchcock, 1899.
Source Firkin
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
CC0 and seamless wellington boot pattern.
Source SliverKnight
A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin