A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Formed from a tile that can be had by selecting the rectangle in Inkscape 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
Seamless SVG vector and JPG backgrounds with faded diagonal stripes. The colors are editable.
Source V. Hartikainen
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
A seamless texture of worn out "cardboard".
Source V. Hartikainen
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
The image is a seamless pattern of a fishnet.
Source Yamachem
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
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 dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin