A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
Abstract Tiled Background Extended 11
Source GDJ
Retro Circles Background 5 No Black
Source GDJ
Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A free seamless background texture that looks like a brown stone wall.
Source V. Hartikainen
Colour version of the original pattern.
Source Firkin
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton