Tileable Off-white Background #1191
 Concrete  CC BY-SA 3.0

A free tileable background colored in off-white (antique white) color.

Source V. Hartikainen

 More Textures
Background pattern 2 #221
 Noise  CC 0

A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.

Source Firkin

Scenery decorative divider #1909
 Dark  CC 0

Vector version of a png that was uploaded to Pixabay by pencilparker

Source Firkin

Raindrop-seamless pattern #2558
 Blue  CC 0

This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.

Source Yamachem

Wood Background Pattern #882
 Wood  CC BY-SA 3.0

A seamless background pattern with a texture of wood planks. This wood background pattern has vertically arranged planks. You may try to rotate it 90°, to see how it will look like when the wood planks are arranged horizontally.

Source V. Hartikainen

White [email protected] #728
 Grid  CC BY-SA 3.0

A nice and simple white rotated tile pattern.

Source Another One

Prismatic Snowflakes Pattern 3 No Background #413
 Light  CC 0

Prismatic Snowflakes Pattern 3 No Background

Source GDJ

Background pattern green #1953
 Green  CC 0

To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Colorful Stripes Background #400
 Noise  CC 0

Colorful Stripes Background

Source GDJ

Micro Carbon #7
 Carbon  CC BY-SA 3.0

Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.

Source Atle Mo

Small Crackle Bright #352
 Light  CC BY-SA 3.0

Light gray pattern with an almost wall tile-like appearance.

Source Markus Tinner

Light Paper [email protected] #836
 Paper  CC BY-SA 3.0

More in the paper realm, this time with fibers.

Source Jorge Fuentes

Egg [email protected] #862
 Light  CC BY-SA 3.0

It’s an egg, in the form of a pattern. This really is 2012.

Source Paul Phönixweiß

Stone Wall & Dark #1547
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Background pattern green #1944
 Green  CC 0

To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Sixties background #1919
 Colorful  CC 0

Fix side and a seamless starry tile.

Source SliverKnight

Background pattern 236 #2249
 Dark  CC 0

Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Stone Wall & Red #1507
 Red  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Crow and bird pattern #1965
 Dark  CC 0

CC0 remixed from a drawing. Walter Crane, 1914, Firkin.

Source SliverKnight

Nistri #773
 Stripes  CC BY-SA 3.0

No idea what Nistri means, but it’s a crisp little pattern nonetheless.

Source Markus Reiter

Cover Green #1283
 Dark  CC 0

Zero CC tileable hard cover green book, scanned and made by me. CC0

Source Sojan Janso

[email protected] #126
 Dark  CC BY-SA 3.0

And some more testing, this time with Seamless Studio. It’s Robots FFS!

Source Seamless Studio

[email protected] #668
 Dark  CC BY-SA 3.0

Your eyes can trip a bit from looking at this – use it wisely.

Source Michal Chovanec

Mix & Black Pattern #1634
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Fabric Pattern with Stitch Holes #1163
 Fabric  CC BY-SA 3.0

A grayscale fabric pattern with vertical lines of stitch holes.

Source V. Hartikainen

Pewter #1638
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Exclusive [email protected] #24
 Light  CC BY-SA 3.0

Paper pattern with small dust particles and 45-degree strokes.

Source Atle Mo

Grid #974
 Gray  CC BY-SA 3.0

There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.

Source Dominik Kiss

Floral background 18 (negative) #1832
 Dark  CC 0

Negative version of the original

Source Firkin

Grunge [email protected] #82
 Wall  CC BY-SA 3.0

Light gray grunge wall with a nice texture overlay.

Source Adam Anlauf