Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Retro Circles Background 7 No Black
Source GDJ
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
A seamless pattern formed from background pattern 102
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless striped fabric-like texture colored in a dark reddish brown color.
Source V. Hartikainen
Looks like an old wall. I guess that’s it then?
Source Viahorizon
This is the remix of "Strawberry Pattern Background" uploaded by "GDJ". Thanks. I realigned strawberries so as to get seamless and changed the BG color.
Source Yamachem
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin