Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
Prismatic Triangular Background Design Mark II 5
Source GDJ
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
A white version of the very popular linen pattern.
Source Ant Ekşiler
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
Number five from the same submitter, makes my job easy.
Source Dima Shiper
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen