Sort of reminds me of those old house wallpapers.
Source Tish
A seamless pattern formed from miutopia's cakes on a tablecloth.
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Might not be super subtle, but quite original in its form.
Source Alex Smith
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Subtle scratches on a light gray background.
Source Andrey Ovcharov
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Background pattern originally a PNG drawn in Paint.net
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
Just like the black maze, only in light gray. Duh.
Source Peax
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Could be paper, could be a Polaroid frame – up to you!
Source Chaos