Patern dots #241
 Dark  CC 0

Pattern repeating background 48x48

Source Keistutis

 More Textures
Rough Concrete Surface #1195
 Concrete  CC BY-SA 3.0

This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.

Source V. Hartikainen

Prismatic Snowflakes Pattern 3 No [email protected] #781
 Light  CC 0

Prismatic Snowflakes Pattern 3 No Background

Source GDJ

Background pattern 306 (colour 2) #1881
 Colorful  CC 0

Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.

Source Firkin

Background pattern 306 (colour 3) #1880
 Colorful  CC 0

Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.

Source Firkin

Floral background 17 (colour 3) #1849
 Blue  CC 0

Remixed from a JPG that was uploaded to Pixabay by theasad121

Source Firkin

[email protected] #896
 Light  CC BY-SA 3.0

Could remind you a bit of those squares in Super Mario Bros, yeh?

Source Jeff Wall

Colorful Stripes [email protected] #794
 Noise  CC 0

Colorful Stripes Background

Source GDJ

Background pattern 314 (colour 2) #1838
 Green  CC 0

The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i

Source Firkin

White [email protected] #1184
 Wall  CC BY-SA 3.0

Brushed aluminum, in a bright gray version. Lovely 2X as well.

Source Andre Schouten

Floors #1593
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Fabric (Plaid)@2X #592
 Fabric  CC BY-SA 3.0

You know you can’t get enough of these linen-fabric-y patterns.

Source James Basoo

45-Degree Fabric #1
 Fabric  CC BY-SA 3.0

Medium gray fabric pattern with 45-degree lines going across.

Source Atle Mo

Sine wave background 2 #1734
 Dark  CC 0

The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i

Source Firkin

Bright Squares #87
 Light  CC BY-SA 3.0

It’s okay to be square! A nice light gray pattern with random squares.

Source Waseem Dahman

Background pattern 252 (colour 6) #2157
 Light  CC 0

Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Micro [email protected] #8
 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

Background pattern 225 (colour 3) #2325
 Pink  CC 0

Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.

Source Firkin

Floral background 18 (negative) #1832
 Dark  CC 0

Negative version of the original

Source Firkin

Floors #1587
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Background pattern 263 #2073
 Pink  CC 0

Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.

Source Firkin

Decorative divider 300 #1715
 Dark  CC 0

Derived from a PNG that was uploaded to Pixabay by nutkitten

Source Firkin

Green Web Background, Seamless tile #1332
 Green  CC BY-SA 3.0

Green Web Background, Seamless tile.

Source V. Hartikainen

Decorative divider 188 #2521
 Dark  CC 0

From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.

Source Firkin

Wavy background #2020
 Green  CC 0

CC0 and a seamless pattern from a tile drawn in Paint.net .

Source SliverKnight

Red  #1256
 Red  CC 0

Zerro CC tillable texture of stones photographed and made by me. CC0

Source Sojan Janso

Zig-zag pattern #2418
 Grid  CC 0

A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.

Source Firkin

Pewter #1638
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Prismatic Isometric Cube Extra Pattern No [email protected] #789
 Light  CC 0

Prismatic Isometric Cube Extra Pattern No Background

Source GDJ