This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
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
Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.
Source Firkin
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
A repeating gloomy background image. This one consists of a pattern of black chains layered on top of a dark textured background.
Source V. Hartikainen