Green Fibers #91
Dark CC BY-SA 3.0The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
More Textures
Aged Grid Paper Background #1072
Paper CC BY-SA 3.0A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Metal Background Pattern With Rivets #1085
Metal CC BY-SA 3.0This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.
Source V. Hartikainen
Brushed Alum@2X #68
Light CC BY-SA 3.0A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Booze pattern #1727
Noise CC 0The tile this is based on was adapted from an image that was uploaded to Pixabay by frolicsomepl. It can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Black Linen@2X #64
Dark CC BY-SA 3.0In the spirit of WWDC 2011, here is a dark iOS inspired linen pattern.
Source Atle Mo
Dark Wall #1253
Wall CC 0Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
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
Notebook@2X #1179
Gray CC BY-SA 3.0This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Background pattern 197 #2513
Green CC 0A version without colours blended together to give a different look.
Source Firkin
Decorative divider 207 #2367
Dark CC 0Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background@2X #546
Dark CC 0Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Prismatic Hypnotic Pattern No Background@2X #572
Noise CC 0Prismatic Hypnotic Pattern No Background
Source GDJ
Triangular@2X #1157
Gray CC BY-SA 3.0Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Cross Stripes #47
Dark CC BY-SA 3.0Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Pattern cleanup 4 #157
Noise CC 0An attempt for cleaning up the original image in a few steps.
Source Lazur URH
Tree and bird pattern #1983
Dark CC 0From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Background pattern 259 (colour 6) #2097
Blue CC 0Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Black Scales #191
Dark CC BY-SA 3.0Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker