Small Crackle Bright #352
Light CC BY-SA 3.0Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
More Textures
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
Background pattern 238 #2229
Red CC 0To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Mirrored Squares@2X #124
Dark CC BY-SA 3.0Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
"Dark Brick Wall", Background Pattern #1024
Stone CC BY-SA 3.0Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
polka dot seamless pattern #2531
Light CC 0The image depicts polka dot seamless pattern.
Source Yamachem
Cream Pixels@2X #1145
Light CC BY-SA 3.0If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman
Subtle Orange Emboss #97
Light CC BY-SA 3.0A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Tileable Off-white Background #1191
Concrete CC BY-SA 3.0A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
Background pattern 323 (colour 5) #1808
Noise CC 0Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Batthern #324
Grid CC BY-SA 3.0Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Retro Circles Background 8 No Black@2X #438
Dark CC 0Retro Circles Background 8 No Black
Source GDJ
Prismatic 3D Isometric Tessellation Pattern 6 #148
Dark CC 0Prismatic 3D Isometric Tessellation Pattern 6
Source GDJ
Floral divider 4 #1750
Dark CC 0From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Light Toast #759
Paper CC BY-SA 3.0Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Tree and bird pattern #1982
Green CC 0From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Background pattern 230 (colour 3) #2303
Green CC 0To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Cube Well & Blue #1699
Wall CC 0Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Prismatic Abstract Line Art Pattern Background #565
Dark CC 0Prismatic Abstract Line Art Pattern Background
Source GDJ
WaveCut@2X #76
Light CC BY-SA 3.0If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Floral background #1976
Dark CC 0Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin