This was formed by distorting an image of a background on Pixabay.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Derived from an image that was uploaded to Pixabay by pugmom40
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Seamless Background For Websites. It has a texture similar to cork-board.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
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
A version without colours blended together to give a different look.
Source Firkin
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
Prismatic Abstract Geometric Background 4
Source GDJ
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso