P4 #1111
Light CC BY-SA 3.0I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
More Textures
Prismatic 3D Isometric Tessellation Pattern 6 #148
Dark CC 0Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
Tessellation 15 (colour 2) #2221
Yellow CC 0The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Subtle Website Background #1022
Stone CC BY-SA 3.0Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
P5 #1113
Light CC BY-SA 3.0Number five from the same submitter, makes my job easy.
Source Dima Shiper
Skewed Print #819
Dark CC BY-SA 3.0An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
Lego background #266
Noise CC 0Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Aged Paper Background Tile #1074
Paper CC BY-SA 3.0A seamless background tile of aged paper with shabby look.
Source V. Hartikainen
Decorative divider 274 #1922
Dark CC 0Redrawn based on a drawing in 'По Сѣверо-Западу Россіи' Konstantin Sluchevsky, 1897.
Source Firkin
Rough Concrete Surface #1194
Concrete CC BY-SA 3.0A seamless texture of a rough concrete surface.
Source V. Hartikainen
Inspiration Geometry #1175
Unknow CC BY-SA 3.0This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Chain background #2063
Dark CC 0Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
Background pattern 309 #1866
Yellow CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Prismatic Isometric Cube Wireframe Pattern No Background #499
Light CC 0Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Block Well #1696
Colorful CC 0Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Wood@2X #50
Wood CC BY-SA 3.0Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Vintage pattern #1958
Grid CC 0Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
Carbon Fiber Big #326
Carbon CC BY-SA 3.0Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Dark Wall #817
Dark CC BY-SA 3.0Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Background pattern 41 #262
Fabric CC 0A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Black And White Floral Pattern Background Inverse #196
Dark CC 0Black And White Floral Pattern Background Inverse
Source GDJ
Dark Blue Gray Wallpaper Texture #901
Stripes CC BY-SA 3.0This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Diagonal Waves@2X #1007
Gray CC BY-SA 3.0It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
"Glossy Pink Fur", Pink Background Pattern #1235
Pink CC BY-SA 3.0Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen