Light Gray@2X #1204
Gray CC BY-SA 3.0Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
More Textures
Background pattern 246 (colour 2) #2185
Green CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Mossy #1296
Stone CC 0ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Noisy Grid #959
Gray CC BY-SA 3.0This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.
Source Vectorpile
Carbon Fiber Big@2X #327
Carbon CC BY-SA 3.0Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Seamless Gray Stone Background #1028
Stone CC BY-SA 3.0This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
Decorative divider 187 #2522
Dark CC 0From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Light Gray #1203
Gray CC BY-SA 3.0Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Redox 01@2X #850
Light CC BY-SA 3.0Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Repeating Stone-Like Background (Dark Brown) #1056
Stone CC BY-SA 3.0A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
Leafy pattern 5 #1854
Dark CC 0Remixed from a JPG that was uploaded to Pixabay by susanlu4esm
Source Firkin
Background pattern 315 (colour 4) #1842
Colorful CC 0The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Notebook@2X #1179
Gray CC BY-SA 3.0This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Concrete Wall #77
Wall CC BY-SA 3.0Dark blue concrete wall with some small dust spots.
Source Atle Mo
Background pattern 222 #2345
Green CC 0Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
ecorative divider 190 #2516
Dark CC 0From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
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
Gradient Squares@2X #694
Grid CC BY-SA 3.0It’s big, it’s gradient—and it’s square.
Source Brankic1979
Background pattern 21 #205
Light CC 0A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Background pattern 245 (colour 4) #2189
Yellow CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Squares@2X #303
Dark CC BY-SA 3.0Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan