This was formed by distorting an image of a background on Pixabay.
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
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
This background pattern has futuristic look. So, maybe it could be used on websites or blogs dedicated to video games?!
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Lovely pattern with splattered vintage speckles.
Source David Pomfret
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
Prismatic Floral Background No Black
Source GDJ