Seamless Wood Pattern #889
Wood CC BY-SA 3.0A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
More Textures
Triangles@2X #744
Grid CC BY-SA 3.0Sharp but soft triangles in light shades of gray.
Source Pixeden
Tessellation 16 (colour 3) #2213
Green CC 0The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Background pattern 240 #2209
Dark CC 0Remixed from a drawing in 'A Girl in Ten Thousand', Elizabeth Meade, 1896.
Source Firkin
Sine wave background 2 #1734
Dark CC 0The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Background pattern 315 #1845
Blue CC 0The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Background pattern 313 #1858
Dark CC 0Background pattern originally a PNG drawn in Paint.net
Source Firkin
White Brick Wall #593
Wall CC BY-SA 3.0If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Noisy Grid@2X #960
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
Background pattern 308 #1872
Yellow CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Wallpaper Tile 13 #240
Light CC 0An abstract Background pattern of purple twisty patterns.
Source TikiGiki
Prismatic Groovy Concentric Background 4 #461
Noise CC 0Prismatic Groovy Concentric Background 4
Source GDJ
Background pattern 245 (colour 3) #2190
Blue CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Grey Washed Wall #1128
Wall CC BY-SA 3.0This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
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
White Wall 3 #1148
Wall CC BY-SA 3.0This one needs to be used in small areas; you can see it repeat.
Source Luca
Dark Concrete Wall #1193
Concrete CC BY-SA 3.0A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
"Black Metal Grid", Seamless Background Pattern #1080
Metal CC BY-SA 3.0A free seamless background pattern for use on websites.
Source V. Hartikainen
Bedge Grunge #978
Paper CC BY-SA 3.0A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Prismatic Curved Diamond Pattern 7 No Background #547
Noise CC 0Prismatic Curved Diamond Pattern 7 No Background
Source GDJ