Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
Retro Circles Background 5 No Black
Source GDJ
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Square design drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Kaleidoscope Prismatic Abstract No Background
Source GDJ
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
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
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
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
Light and tiny, just the way you like it.
Source Rohit Arun Rao
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
Prismatic Hypnotic Pattern No Background
Source GDJ
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo