The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
A repeating background of beige paper with vintage look. Repeats to infinity, as usual.
Source V. Hartikainen
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i
Source Firkin
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
This was formed by distorting an image of a background on Pixabay.
Source Firkin
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
Can’t believe we don’t have this in the collection already! Slick woven pattern with crisp details.
Source Max Rudberg