To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This background pattern has futuristic look. So, maybe it could be used on websites or blogs dedicated to video games?!
Source V. Hartikainen
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Oh yes, it happened! A pattern in full color.
Source Atle Mo
You guessed it – looks a bit like cloth.
Source Peax Webdesign
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
You may use it as is, or modify it as you like.
Source V. Hartikainen
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
Sort of reminds me of those old house wallpapers.
Source Tish
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin