Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
CC0 and seamless wellington boot pattern.
Source SliverKnight
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
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Colorful Floral Background 3 No Black
Source GDJ
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten