Colourful background achieved with gradient fills.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
CC0 and seamless wellington boot pattern.
Source SliverKnight
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker