Mocha Grunge@2X #1100
Gray CC BY-SA 3.0You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
More Textures
Background pattern 26 (black) #199
Dark CC 0Pattern formed from simple shapes. Black version.
Source Firkin
MBossed #193
Grid CC BY-SA 3.0Embossed lines and squares with subtle highlights.
Source Alex Parker
Light Gray #1203
Gray CC BY-SA 3.0Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Concrete Wall #77
Wall CC BY-SA 3.0Dark blue concrete wall with some small dust spots.
Source Atle Mo
Prismatic Polka Dots Mark II 3 No Background #534
Noise CC 0Prismatic Polka Dots Mark II 3 No Background
Source GDJ
Debut Light@2X #1013
Light CC BY-SA 3.0Classic 45-degree pattern, light version.
Source Luke McDonald
Dark Tile-able Grunge Texture #1123
Grunge CC BY-SA 3.0Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Dark Fish Skin@2X #1049
Dark CC BY-SA 3.0It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Noisy Net@2X #977
Dark CC BY-SA 3.0Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Soft Kill #318
Dark CC BY-SA 3.0Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Prismatic Abstract Geometric Background 5 No Black@2X #792
Noise CC 0Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Triangular@2X #1157
Gray CC BY-SA 3.0Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Prismatic Snowflakes Pattern 2 No Background #412
Light CC 0Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Prismatic Rounded Squares Grid 4 No Background #491
Noise CC 0Prismatic Rounded Squares Grid 4 No Background
Source GDJ
White Texture #131
Light CC BY-SA 3.0Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Clean gray paper@2X #860
Paper CC BY-SA 3.0On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Seamless Blue On Yellow Background #1160
Grid CC BY-SA 3.0This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
Pinstriped Suit #665
Dark CC BY-SA 3.0Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Light Grey Floral Motif@2X #345
Wall CC BY-SA 3.0Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Decorative divider 254 #2040
Dark CC 0Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857
Source Firkin
Light Paper Fibers@2X #836
Paper CC BY-SA 3.0More in the paper realm, this time with fibers.
Source Jorge Fuentes
Rice Paper 2@2X #341
Paper CC BY-SA 3.0One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
P4@2X #1112
Light CC BY-SA 3.0I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
Background pattern 339 (colour 2) #1707
Green CC 0The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin