Concrete Wall 2 #79
 Wall  CC BY-SA 3.0

A light gray wall or floor (you decide) of concrete.

Source Atle Mo

 More Textures
Floors & Block #1598
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Background pattern 19 (black) #203
 Dark  CC 0

A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.

Source Firkin

Floors #1593
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

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

Tactile [email protected] #6
 Dark  CC BY-SA 3.0

A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.

Source Atle Mo

My Little Plaid #332
 Light  CC BY-SA 3.0

Repeating squares overlapping.

Source Pete Fecteau

Light & Boards #1297
 Wood  CC 0

ZeroCC tileable wood boards texture, photographed and made by me. CC0

Source Sojan Janso

Square ornament 41 #2085
 Dark  CC 0

Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.

Source Firkin

More Rough Wood 7 #1433
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Wood 11 #1456
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

White Plaster #368
 Wall  CC BY-SA 3.0

Sweet and subtle white plaster with hints of noise and grunge.

Source Phil Maurer

Floral background 21 #1785
 Dark  CC 0

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

Source Firkin

More Rough Wood 3 #1429
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Prismatic Hexagonalism Pattern No [email protected] #803
 Light  CC 0

Prismatic Hexagonalism Pattern No Background

Source GDJ

Gray Striped Background #906
 Stripes  CC BY-SA 3.0

Here's a bluish gray striped background pattern for use on web sites.

Source V. Hartikainen

Background pattern 255 #2142
 Dark  CC 0

Colour version of the original pattern.

Source Firkin

Prismatic Groovy Concentric [email protected] #450
 Noise  CC 0

Prismatic Groovy Concentric Background

Source GDJ

Waves #1694
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Light Gray Fabric Pattern With Faded Stripes #965
 Stripes  CC BY-SA 3.0

A light gray fabric pattern with faded vertical stripes.

Source V. Hartikainen

Paper 1 #2112
 Paper  CC 0

CC0 textures, backgrounds.

Source SliverKnight

Background pattern 252 (colour 2) #2156
 Brown  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

Stone Wall & Purple #1565
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Prismatic Abstract Geometric Background [email protected] #793
 Noise  CC 0

Prismatic Abstract Geometric Background 5

Source GDJ

Prismatic Abstract Background Design #403
 Noise  CC 0

Prismatic Abstract Background Design

Source GDJ

Background pattern 328 (colour 2) #1800
 Green  CC 0

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

Source Firkin

Stone Wall & Yellow #1516
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Floors & Block #1599
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Pyramid #895
 Light  CC BY-SA 3.0

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

Source Jeff Wall

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 Basic Pattern 2 No Background #447
 Noise  CC 0

Prismatic Basic Pattern 2 No Background

Source GDJ