Abstract Water Texture (Seamless) #890
Water CC BY-SA 3.0An abstract texture of water. It's not perfect, but will do. You may download if you like it.
Source V. Hartikainen
More Textures
Background pattern 215 (colour 2) #2370
Blue CC 0A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Prismatic Geometric Pattern Background #407
Noise CC 0Prismatic Geometric Pattern Background
Source GDJ
Prismatic Snowflakes Pattern 2 No Background #412
Light CC 0Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Background pattern 252 (colour 6) #2157
Light CC 0Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Fake Luxury@2X #622
Diamond CC BY-SA 3.0Fake or not, it’s quite luxurious.
Source Factorio.us Collective
GPlay@2X #736
Light CC BY-SA 3.0A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Debut Light@2X #1013
Light CC BY-SA 3.0Classic 45-degree pattern, light version.
Source Luke McDonald
Soft Wallpaper #95
Wall CC BY-SA 3.0Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Nami@2X #576
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
Wall #1245
Wall CC 0Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Textured Paper Background (Vanilla Yellow) #1219
Yellow CC BY-SA 3.0Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
Decorative divider 217 #2233
Dark CC 0Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Background pattern 302 (colour 2) #1887
Green CC 0Alternative colour scheme to the original.
Source Firkin
Black Thread@2X #600
Dark CC BY-SA 3.0Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
Background pattern 117@2X #525
Noise CC 0A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Background pattern 290 #1932
Dark CC 0To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Noisy@2X #46
Paper CC BY-SA 3.0Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
White carbon@2X #12
Carbon CC BY-SA 3.0Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
Diamond pattern (colour 6) #2280
Yellow CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Axiom Pattern #330
Grid CC BY-SA 3.0Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Pinstriped Suit #665
Dark CC BY-SA 3.0Just like your old suit, all striped and smooth.
Source Alex Berkowitz
"Seamless Bark", Website Background. #879
Wood CC BY-SA 3.0This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Sativa #1306
Dark CC BY-SA 3.0Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Decorative divider 216 #2243
Dark CC 0Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Grunge Wall #81
Wall CC BY-SA 3.0Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf