CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Prismatic Groovy Concentric Background 3
Source GDJ
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Prismatic Polka Dots 3 No Background
Source GDJ
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen