A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Prismatic Abstract Background Design
Source GDJ
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A textured blue background pattern with vertical stripes.
Source V. Hartikainen
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
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 the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin