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
More Textures
Prismatic Geometric Pattern Background 2 No Black@2X #784
Noise CC 0Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Concrete #1361
Wall CC 0Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Background pattern 258 #2135
Dark CC 0Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
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
Warped Stripes on Paper #1073
Paper CC BY-SA 3.0A seamless background of warped stripes on paper.
Source V. Hartikainen
Prismatic Abstract Geometric Background 5 No Black #402
Noise CC 0Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Prismatic Geometric Pattern Background@2X #787
Noise CC 0Prismatic Geometric Pattern Background
Source GDJ
Navy@2X #985
Dark CC BY-SA 3.0It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
Decorative divider 239 #2087
Dark CC 0From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Abstract Paper-Like Background With Colorful Stains #1226
Yellow CC BY-SA 3.0An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
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
Subtle Stripes@2X #752
Stripes CC BY-SA 3.0Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
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
Seed #1289
Wall CC 0Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
"Beige Wall", Tileable Background #1189
Concrete CC BY-SA 3.0This beige background pattern resembles a concrete wall with engravings or something similar to it.
Source V. Hartikainen
Background pattern 309 (colour 4) #1863
Green CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Lined Paper #1034
Light CC BY-SA 3.0I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
Cells #1285
Paper CC 0Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
Feathered #1324
Unknow CC BY-SA 3.0This is sort of fresh, but still feels a bit old school.
Source Martuchox
Striped Fabric Pattern #998
Stripes CC BY-SA 3.0A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.
Source V. Hartikainen
Green Fibers@2X #92
Dark CC BY-SA 3.0The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Pyramid@2X #896
Light CC BY-SA 3.0Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Brick & Red #1374
Wall CC 0Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett