This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
From a drawing in 'Worsborough; its historical associations and rural attractions', Joseph Wilkinson, 1879.
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Prismatic Curved Diamond Pattern No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
Prismatic Basic Pattern 2 No Background
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
This one is amazing, truly original. Go use it!
Source Viahorizon
Prismatic Groovy Concentric Background
Source GDJ
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin