Rough Concrete Surface #1194
 Concrete  CC BY-SA 3.0

A seamless texture of a rough concrete surface.

Source V. Hartikainen

 More Textures
Beige Paper #83
 Paper  CC BY-SA 3.0

This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.

Source Konstantin Ivanov

Scallop #1690
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

[email protected] #726
 Fabric  CC BY-SA 3.0

Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.

Source Janos Koos

Melty & Red #1665
 Metal  CC 0

Misc. CC0 License.

Source Unknow

Tile-able Wall Texture (Light Orange Brown) #1051
 Stone  CC BY-SA 3.0

A seamless texture of an abstract wall colored in shades of light orange brown.

Source V. Hartikainen

Worn [email protected] #710
 Fabric  CC BY-SA 3.0

These dots are already worn for you, so you don’t have to.

Source Matt McDaniel

White Bed Sheet #821
 Light  CC BY-SA 3.0

Nothing like a clean set of bed sheets, huh?

Source Badhon Ebrahim

Colorful Floral Background No [email protected] #482
 Light  CC 0

Colorful Floral Background No Black

Source GDJ

Subtle White [email protected] #1104
 Light  CC BY-SA 3.0

This one is amazing, truly original. Go use it!

Source Viahorizon

Repeating Vintage Paper Background #1077
 Paper  CC BY-SA 3.0

A repeating background of beige paper with vintage look. Repeats to infinity, as usual.

Source V. Hartikainen

Background pattern 235 (colour 6) #2250
 Red  CC 0

To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Background pattern 229 #2305
 Colorful  CC 0

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

Source Firkin

Pinstripe #35
 Light  CC BY-SA 3.0

Light gray pattern with a thin pinstripe.

Source Brandon

Vintage pattern #1960
 Grid  CC 0

Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.

Source Firkin

Prismatic Dots Background 8 #515
 Noise  CC 0

Prismatic Dots Background 8

Source GDJ

More Rough Wood 6 #1432
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Food #1300
 Yellow  CC BY-SA 3.0

Holy mackerel, it’s colorful—but still subtle.

Source Ilya

Gears pattern 4 (colour 3) #2236
 Blue  CC 0

A seamless pattern formed from gears.

Source Firkin

Brushed Aluminum 1 #1389
 Metal  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Decorative divider #1974
 Dark  CC 0

Adapted from a drawing in 'Line and form', Walter Crane, 1914.

Source Firkin

Background pattern 215 (colour 3) #2369
 Pink  CC 0

A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.

Source Firkin

Brushed Aluminum 2 #1390
 Metal  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Ribbon pattern 2 (version 2, colour 6) #2034
 Pink  CC 0

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

Source Firkin

Leafy pattern 12 #1764
 Dark  CC 0

From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.

Source Firkin

Symphony #1339
 Light  CC BY-SA 3.0

Enjoy this like classical music.

Source iliad

Diamond pattern (colour 5) #2281
 Red  CC 0

From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Wavy background #2021
 Pink  CC 0

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

Source SliverKnight