A repeating background with wood/straw like texture.
Source V. Hartikainen
A simple bump filter made upon request at irc #inkscape at freenode. Made a screen capture of the making here: https://youtu.be/TGAWYKVLxQw
Source Lazur URH
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Remixed from an image that was uploaded to Pixabay by KirstenStar
Source Firkin
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Snap! It’s a pattern, and it’s not grayscale! Of course you can always change the color in Photoshop.
Source Atle Mo
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
A dark background pattern/texture of a dimpled metal plate.
Source V. Hartikainen
Seamless Green Tile Background
Source V. Hartikainen
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
This light background pattern has a texture of "frozen" surface with diagonal stripes. Here's an yet another addition to the collection of free website backgrounds.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
An alternative colour scheme to the original seamless pattern.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Prismatic Groovy Concentric Background 5
Source GDJ
This one needs to be used in small areas; you can see it repeat.
Source Luca
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
A bit strange this one, but nice at the same time.
Source Diogo Silva
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov