"Dark Brick Wall", Background Pattern #1024
Stone CC BY-SA 3.0Like 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
More Textures
Background pattern 246 (colour 3) #2184
Green CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Background pattern 228 #2308
Colorful CC 0Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Background pattern 224 (colour 5) #2338
Colorful CC 0To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Black Metallic Pattern #1090
Metal CC BY-SA 3.0A free black metallic background pattern. Here's a new pattern I made that looks metallic.
Source V. Hartikainen
Concrete Wall 2@2X #80
Wall CC BY-SA 3.0A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Floral design 108 #1706
Dark CC 0Derived from an image that was uploaded to Pixabay by darkmoon1968
Source Firkin
Visual illusion #2586
Grid CC 0The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Green Web Background, Seamless tile #1332
Green CC BY-SA 3.0Green Web Background, Seamless tile.
Source V. Hartikainen
Background pattern 308 #1872
Yellow CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Background pattern 225 (colour 3) #2325
Pink CC 0Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Prismatic Snowflakes Pattern 3 No Background@2X #781
Light CC 0Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Fruit on a branch #1967
Dark CC 0From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background #534
Noise CC 0Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Fleurs-de-lys pattern 2 (colour) #2204
Colorful CC 0Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin
Background pattern 5 #224
Noise CC 0A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
Background pattern 336 (colour 2) #1720
Green CC 0Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Prismatic Triangular Background Design Mark II 5 #406
Dark CC 0Prismatic Triangular Background Design Mark II 5
Source GDJ
Background pattern 1 #220
Noise CC 0A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Dark Stripes #39
Dark CC BY-SA 3.0Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
Background pattern 297 #1902
Red CC 0Remixed from an image on Pixabay, the original having been uploaded by darkmoon1968.
Source Firkin
Prismatic Curved Diamond Pattern 4 No Background@2X #542
Diamond CC 0Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Nistri #773
Stripes CC BY-SA 3.0No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
Lichen #1293
Stone CC 0Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso