This is so subtle you need to bring your magnifier!
Source Carlos Valdez
From a drawing in 'Hyde Park from Domesday-Book to date', John Ashton, 1896.
Source Firkin
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
You know you love wood patterns, so here’s one more.
Source Richard Tabor
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Colorful Floral Background 3 No Black
Source GDJ
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
Prismatic Groovy Concentric Background 3
Source GDJ
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin