This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Prismatic Abstract Geometric Background 4
Source GDJ
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
Prismatic Polyskelion Pattern No Background
Source GDJ
Formed by distorting a JPG from PublicDomainPictures
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. Alternative colour scheme.
Source Firkin
The original enhanced with some gradients.
Source Firkin
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Feel free to download and use it, or see the rest of the dark background patterns that I have made. Anyway, I hope you will find something that you like.
Source V. Hartikainen
Tiny circle waves, almost like the ocean.
Source Sagive
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
A free pink background pattern.
Source V. Hartikainen
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin