Embossed lines and squares with subtle highlights.
Source Alex Parker
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Looks like an old rug or a computer chip.
Source Patutin Sergey
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Black And White Floral Pattern Background Inverse
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin