Wide Rectangles #699
Wall CC BY-SA 3.0Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
More Textures
Background pattern 308 (colour 2) #1871
Green CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Green Gobbler@2X #86
Dark CC BY-SA 3.0Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
Glass block pattern #2477
Brown CC 0Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.
Source Firkin
Large Leather@2X #650
Paper CC BY-SA 3.0More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Batthern@2X #325
Grid CC BY-SA 3.0Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Candyhole@2X #357
Light CC BY-SA 3.0It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Page ornament 54 #2059
Dark CC 0Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Green Tiles, Background Pattern #1329
Green CC BY-SA 3.0A free background pattern with abstract green tiles.
Source V. Hartikainen
Prismatic Floral Background No Black@2X #476
Light CC 0Prismatic Floral Background No Black
Source GDJ
Checkered Light Emboss #280
Grid CC BY-SA 3.0Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Watercolor #1477
Colorful CC 0Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Blue on White Background Pattern #993
Stripes CC BY-SA 3.0A background pattern with blue on white vertical stripes.
Source V. Hartikainen
Leafy decorative divider #1760
Dark CC 0From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Subtle White Feathers@2X #1104
Light CC BY-SA 3.0This one is amazing, truly original. Go use it!
Source Viahorizon
Diamond pattern 2 (colour 5) #2264
Blue CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Seamless Blue On Yellow Background #1160
Grid CC BY-SA 3.0This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
Background patter 294 #1920
Dark CC 0Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
White Linen@2X #840
Light CC BY-SA 3.0Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
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
"Light Green Wall", Repeatable Texture #1190
Concrete CC BY-SA 3.0Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Tessellation 16 #2215
Yellow CC 0The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin