Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Might not be super subtle, but quite original in its form.
Source Alex Smith
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless background texture of old cardboard.
Source V. Hartikainen
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
Derived from a JPG that was uploaded to Pixabay by ractapopulous
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Polka Dots Mark II No Background
Source GDJ
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin