Prismatic Abstract Background Design
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
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
This was formed by distorting an image of a background on Pixabay.
Source Firkin
The base gradient edited so now more details are rendered.
Source Lazur URH
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Classic 45-degree pattern, light version.
Source Luke McDonald
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
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
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green