This one needs to be used in small areas; you can see it repeat.
Source Luca
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen
Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
The name is totally random, but hey, it sounds good.
Source Atle Mo
White little knobs, coming in at 10x10px. Sweet!
Source Amos
Prismatic Groovy Concentric Background 4
Source GDJ
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Not the Rebel alliance, but a dark textured pattern.
Source Hendrik Lammers
In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Sometimes you just need the simplest thing.
Source Fabricio