As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Prismatic Abstract Background Design No Black
Source GDJ
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Derived from an image that was uploaded to Pixabay by mdmelo.
Source Firkin
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin