The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
The starting point for this was drawn on the web site steamcoded.org/PolyskelionMaker.svg
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
So tiny, just 7 by 7 pixels – but still so sexy. Ah yes.
Source Dmitriy Prodchenko
White circles connecting on a light gray background.
Source Mark Collins
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
This one is amazing, truly original. Go use it!
Source Viahorizon
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Prismatic Hexagonalist Pattern No Background
Source GDJ
A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.