Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From an image on opengameart.org shared by rubberduck.
Source Firkin
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Black brick wall pattern. Brick your site up!
Source Alex Parker
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
The image is a design of blue glass.How about using it as background image?
Source Yamachem
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A seamless background texture of old cardboard.
Source V. Hartikainen
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Geometric Pattern Background No Black
Source GDJ
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
Fix side and a seamless pattern formed from circles.
Source SliverKnight
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Sometimes you just need the simplest thing.
Source Fabricio