Inflicted@2X #118
Grid CC BY-SA 3.0Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
More Textures
Use Your Illusion@2X #918
Dark CC BY-SA 3.0A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
3D Wood #1475
Wood CC 0Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
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
Background pattern 222 (colour 2) #2344
Brown CC 0A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dark Mosaic #121
Dark CC BY-SA 3.0Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
Background Pattern Green #1939
Green CC 0Fix and cc0 to get the tile this is based on.
Source SliverKnight
Tasky@2X #668
Dark CC BY-SA 3.0Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Fabric of Squares #1095
Light CC BY-SA 3.0As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Soft Kill #318
Dark CC BY-SA 3.0Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Abstract Geometric Monochrome Pattern Prismatic No Background #385
Noise CC 0Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Green Fibers #91
Dark CC BY-SA 3.0The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Tex2res1 #721
Fabric CC BY-SA 3.0Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Pyramid #895
Light CC BY-SA 3.0Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
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
Small Crosses #115
Stripes CC BY-SA 3.0Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Ocean decorative divider #1904
Dark CC 0Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Decorative divider #1962
Dark CC 0From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
fishnet 02 #2473
Dark CC 0This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Page ornament #1988
Dark CC 0From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Background pattern 5 #224
Noise CC 0A pattern drawn in Paint.net and vectorized in Inkscape.
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
Prismatic Curved Diamond Pattern 2 No Background@2X #539
Diamond CC 0Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
"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