Background pattern 223 (colour 6) #2348
Yellow CC 0Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
More Textures
Random Grey Variations #69
Stripes CC BY-SA 3.0Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
“Transparent” Background Pattern #493
Light CC 0An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Rainbow flag pattern #1873
Colorful CC 0The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
Floral background 17 #1851
Green CC 0Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
"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
Subtle Carbon #949
Dark CC BY-SA 3.0There are many carbon patterns, but this one is tiny.
Source Designova
Knitted Sweater@2X #1098
Light CC BY-SA 3.0Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Tex2res5 #725
Fabric CC BY-SA 3.0Number 5 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Chain background #2063
Dark CC 0Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
Micro Carbon #7
Carbon CC BY-SA 3.0Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Prismatic Groovy Concentric Background 5@2X #466
Dark CC 0Prismatic Groovy Concentric Background 5
Source GDJ
Decorative divider 216 #2243
Dark CC 0Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Floral divider 3 #1751
Dark CC 0From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Decorative divider #1995
Yellow CC 0From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
Noisy Net #976
Dark CC BY-SA 3.0Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Seamless Texture of Wood Planks #880
Wood CC BY-SA 3.0Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Background pattern #1941
Brown CC 0Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Dark Tile-able Grunge Texture #1123
Grunge CC BY-SA 3.0Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Prismatic Geometric Pattern Background 2 No Black #410
Noise CC 0Prismatic Geometric Pattern Background 2 No Black
Source GDJ
Grid Me@2X #606
Grid CC BY-SA 3.0Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Background pattern 112 #263
Fabric CC 0A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
MBossed #193
Grid CC BY-SA 3.0Embossed lines and squares with subtle highlights.
Source Alex Parker
Green Fibers #91
Dark CC BY-SA 3.0The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Paper 2 #21
Paper CC BY-SA 3.0New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
GPlay #735
Light CC BY-SA 3.0A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra