A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
Pattern formed from simple shapes. Black version.
Source Firkin
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn