Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
We have some linen patterns here, but none that are stressed. Until now.
Source Jordan Pittman
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
Continuing the geometric trend, here is one more.
Source Mike Warner
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
From a drawing in 'Less Black than we're painted', James Payn, 1884.
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 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
Prismatic Geometric Pattern Background 2 No Black
Source GDJ