Redox 01 #849
Light CC BY-SA 3.0Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
More Textures
Decorative divider #1995
Yellow CC 0From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
Geometric pattern #2004
Grid CC 0A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
P5@2X #1114
Light CC BY-SA 3.0Number five from the same submitter, makes my job easy.
Source Dima Shiper
"Colorful Stripes", Diagonally Striped Background #903
Stripes CC BY-SA 3.0This background pattern contains worn out colorful stripes as a texture.
Source V. Hartikainen
Nasty Fabric #1008
Gray CC BY-SA 3.0Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Retina Dust@2X #916
Light CC BY-SA 3.0First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Climpek@2X #776
Grid CC BY-SA 3.0Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
geometrical pattern 01 remix #2456
Wall CC 0This is a remix of "geometrical pattern 01".
Source Yamachem
Wavy background #2013
Pink CC 0A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Background pattern 272 (colour 3) #2055
Red CC 0A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Retro Circles Background 7 No Black@2X #434
Unknow CC 0Retro Circles Background 7 No Black
Source GDJ
Cube Well & Blue #1699
Wall CC 0Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Background pattern 26 (black) #199
Dark CC 0Pattern formed from simple shapes. Black version.
Source Firkin
Light Aluminum #304
Wall CC BY-SA 3.0Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
45-Degree Fabric@2X #2
Fabric CC BY-SA 3.0Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Batthern #324
Grid CC BY-SA 3.0Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Textured Stripes@2X #868
Stripes CC BY-SA 3.0A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
"Light Green Wall", Repeatable Texture #1190
Concrete CC BY-SA 3.0Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
"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
Circles pattern #1917
Yellow CC 0Fix side and a seamless pattern formed from circles.
Source SliverKnight
Decorative divider 297 #1746
Pink CC 0From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin