This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Zero CC tileable ground cracked, crackled, texture, made by me.
Source Sojan Janso
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Prismatic Snowflakes Pattern No Background
Source GDJ
Prismatic Triangular Background Design Mark II 5
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
You guessed it – looks a bit like cloth.
Source Peax Webdesign
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ
From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
The image is a design of blue glass.How about using it as background image?
Source Yamachem