A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
Kaleidoscope Prismatic Abstract 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
Black And White Floral Pattern Background from PDP.
Source GDJ
A cute x, if you need that sort of thing.
Source Juan Scrocchi
A free seamless background texture of "timber wall" (colored in dark brown).
Source V. Hartikainen
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Prismatic Abstract Geometric Background 2 No Black
Source GDJ