Colourful background achieved with gradient fills.
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
Prismatic Abstract Geometric Background 3
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
Colorful Floral Background No Black
Source GDJ
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.
Source V. Hartikainen
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin