Transparent Square Tiles #298
Grid CC BY-SA 3.0The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
More Textures
Nami #575
Dark CC BY-SA 3.0Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Background pattern 259 (colour 3) #2130
Colorful CC 0Remixed 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
Prismatic Geometric Pattern Variation 2 With Background@2X #472
Noise CC 0Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
Dark Sharp Edges #1320
Dark CC BY-SA 3.0Some dark 45 degree angles creating a nice pattern. Huge.
Source Dark Sharp Edges
Black Mamba@2X #58
Dark CC BY-SA 3.0The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Dark Steel Grid Background Pattern #1081
Metal CC BY-SA 3.0Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
Decorative divider 242 #2083
Dark CC 0From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
"Dark Red Canvas", Seamless Web Texture@2X #1222
Red CC BY-SA 3.0A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Redox 01 #849
Light CC BY-SA 3.0Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Decorative divider 220 #2230
Dark CC 0Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin
Abstract Arbitrary Geometric Background@2X #498
Noise CC 0Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Dirty Old Black Shirt #853
Dark CC BY-SA 3.0Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
overlay crack #153
Noise CC 0This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
"Black Groove Stripes", Repeating Background #971
Stripes CC BY-SA 3.0A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
Decorative divider 252 #2065
Dark CC 0Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
Xv #314
Paper CC BY-SA 3.0Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Tweed@2X #1151
Dark CC BY-SA 3.0Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Cartographer #749
Dark CC BY-SA 3.0A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Light Striped Background #937
Stripes CC BY-SA 3.0A light background pattern with diagonal stripes. Here's a simple light striped background for you.
Source V. Hartikainen
Tweed #1150
Dark CC BY-SA 3.0Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
Background pattern 246 (colour 2) #2185
Green CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Repeating Website Background (Blue Gray) #1192
Concrete CC BY-SA 3.0The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen