Soft Wallpaper #95
 Wall  CC BY-SA 3.0

Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.

Source Atle Mo

 More Textures
Brown Canvas, Web Texture #1171
 Fabric  CC BY-SA 3.0

A web texture of brown canvas. Will look great, when used in dark web designs.

Source V. Hartikainen

Decorative divider 232 #2148
 Dark  CC 0

From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.

Source Firkin

Silver Scales #189
 Light  CC BY-SA 3.0

Turn your site into a dragon with this great scale pattern.

Source Alex Parker

Carbon Fiber v2 #105
 Carbon  CC BY-SA 3.0

One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.

Source Atle Mo

Floral pattern 7 (colour 4) #2288
 Green  CC 0

Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.

Source Firkin

Floral background 16 (colour) #1913
 Colorful  CC 0

Floral background 16 (colour)

Source Firkin

Colorful Floral Background 2 #487
 Dark  CC 0

Colorful Floral Background 2

Source GDJ

Stone Wall & Yellow #1580
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Acid Rot & Black #1663
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

Fabric of Squares #1095
 Light  CC BY-SA 3.0

As far as fabric patterns goes, this is quite crisp.

Source Heliodor Jalba

Retro Circles Background [email protected] #421
 Dark  CC 0

Retro Circles Background 4

Source GDJ

Floors & Block #1598
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Cherry pattern #1912
 Unknow  CC 0

Used a cherry by doctormo to make this seamless pattern

Source Firkin

Old Map #1205
 Unknow  CC BY-SA 3.0

An interesting one. Lovely at 2X as well!

Source Andreas Föhl

Background pattern #2000
 Dark  CC 0

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

Source Firkin

Seamless Gray Stone Background #1028
 Stone  CC BY-SA 3.0

This background image has seamless texture that resembles a surface of gray stone.

Source V. Hartikainen

Floral design 100 (version 2, colour) #1772
 Green  CC 0

From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.

Source Firkin

Prismatic Floral Pattern 3 Variation 3 No [email protected] #808
 Noise  CC 0

Prismatic Floral Pattern 3 Variation 3 No Background

Source GDJ

Gun Metal #360
 Dark  CC BY-SA 3.0

With a name this awesome, how can I go wrong?

Source Nikolay Boltachev

Lock and key pattern #1884
 Yellow  CC 0

Seamless pattern formed from a key and lock.

Source Firkin

[email protected] #134
 Light  CC BY-SA 3.0

This reminds me of Game Cube. A nice light 3D cube pattern.

Source Sander Ottens

Crow and bird pattern #1965
 Dark  CC 0

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

Source SliverKnight

Vintage Elegant Floral Background #257
 Fabric  CC 0

PDP

Source GDJ

Prismatic Geometric Tessellation Pattern 2 No [email protected] #554
 Noise  CC 0

Prismatic Geometric Tessellation Pattern 2 No Background

Source GDJ

Asfault 6 #1385
 Dark  CC 0

Gamedev - Asphalt textures. CC0 License.

Source Davit Masia

Colorful Floral Background 3 No Black #485
 Light  CC 0

Colorful Floral Background 3 No Black

Source GDJ

Prismatic Groovy Concentric Background 4 No Black #463
 Noise  CC 0

Prismatic Groovy Concentric Background 4 No Black

Source GDJ

Dark Brown Wood Pattern #884
 Wood  CC BY-SA 3.0

A seamless background pattern of dark brown wood planks.

Source V. Hartikainen