Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Sometimes you just need the simplest thing.
Source Fabricio
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Tiny circle waves, almost like the ocean.
Source Sagive
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
Prismatic Abstract Background Design No Black
Source GDJ
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Prismatic Polyskelion Pattern No Background
Source GDJ
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Background formed from the original with an emboss effect
Source GDJ
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ