A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Remixed from a drawing in 'The Canadian horticulturist', 1892
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
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
Lovely pattern with splattered vintage speckles.
Source David Pomfret
Retro Circles Background 4 No Black
Source GDJ
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
The original has been presented as black on transparent and stored in the pattern definitions. To retrieve the unit tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Smooth Polaroid pattern with a light blue tint.
Source Daniel Beaton