Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
Prismatic Snowflakes Pattern No Background
Source GDJ
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Prismatic Abstract Geometric Background 4
Source GDJ
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen