"Brown Stone Wall" #1026
 Stone  CC BY-SA 3.0

A free seamless background texture that looks like a brown stone wall.

Source V. Hartikainen

 More Textures
Background pattern 203 (colour 2) #2485
 Green  CC 0

A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Fleurs-de-lys pattern 2 (colour) #2204
 Colorful  CC 0

Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.

Source Firkin

Prismatic Curved Diamond Pattern 5 No [email protected] #544
 Diamond  CC 0

Prismatic Curved Diamond Pattern 5 No Background

Source GDJ

Triangular Psychosis 2 #234
 Noise  CC 0

A colorful triangular background, variation 2.

Source GDJ

Background pattern black #2026
 Dark  CC 0

Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Diagonal Striped Brick #679
 Stripes  CC BY-SA 3.0

Might not be super subtle, but quite original in its form.

Source Alex Smith

Floral background #1975
 Colorful  CC 0

Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.

Source Firkin

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

A nice and simple white rotated tile pattern.

Source Another One

Wooden Deligh 1 #1457
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Brushed [email protected] #68
 Light  CC BY-SA 3.0

A light brushed aluminum pattern for your pleasure.

Source Tim Ward

Prismatic Rounded Squares Grid 4 No [email protected] #492
 Noise  CC 0

Prismatic Rounded Squares Grid 4 No Background

Source GDJ

Background pattern 315 (colour 6) #1840
 Green  CC 0

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

Source Firkin

Prismatic Snowflakes Pattern 2 No [email protected] #782
 Light  CC 0

Prismatic Snowflakes Pattern 2 No Background

Source GDJ

"Dark Brick Wall", Background Pattern #1024
 Stone  CC BY-SA 3.0

Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.

Source V. Hartikainen

Beige Stripes #938
 Stripes  CC BY-SA 3.0

A repeating background of beige (or is it more vanilla yellow) textured stripes. One more background with stripes.

Source V. Hartikainen

Background pattern 259 (colour 3) #2130
 Colorful  CC 0

Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Purty Wood #677
 Wall  CC BY-SA 3.0

You know you love wood patterns, so here’s one more.

Source Richard Tabor

Wood Texture 4 #1442
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

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

Light gray grunge wall with a nice texture overlay.

Source Adam Anlauf

Prismatic Abstract Geometric Background 4 No [email protected]@2X #444
 Dark  CC 0

Prismatic Abstract Geometric Background 4

Source GDJ

Background Patterns - Cerulean #245
 Fabric  CC 0

f you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117

Source Viscious-Speed

[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

Wood Texture 1 #1430
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Prismatic Abstract Background [email protected] #791
 Noise  CC 0

Prismatic Abstract Background Design

Source GDJ

Octagonal frame #2355
 Dark  CC 0

Formed in Paint.net and vectorised in Vector Magic.

Source Firkin

White Well & Star #1700
 Wall  CC 0

Background Wall, Art Abstract, Star Well & CC0 texture.

Source Ractapopulous

Floral Seamless Pattern Background #261
 Fabric  CC 0

PDP

Source GDJ

Repeating Stone-Like Background (Dark Brown) #1056
 Stone  CC BY-SA 3.0

A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.

Source V. Hartikainen