Brushed Alum Dark #65
Dark CC BY-SA 3.0Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
More Textures
Background pattern 225 (colour 5) #2323
Blue CC 0Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Floral design 71 #2429
Dark CC 0From a drawing in 'From Snowdon to the Sea. Striking stories of North and South Wales', Marie Trevelyan, 1895.
Source Firkin
Flower 193 #1794
Green CC 0From a drawing in 'Prose and Verse ', William Linton, 1836.
Source Firkin
Background pattern 251 (colour 3) #2165
Blue CC 0To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Decorative divider 299 #1743
Dark CC 0From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Background pattern 277 #2029
Dark CC 0A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Triangles@2X #744
Grid CC BY-SA 3.0Sharp but soft triangles in light shades of gray.
Source Pixeden
Background pattern 266 #2068
Dark CC 0Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
Vintage Speckles@2X #654
Wall CC BY-SA 3.0Lovely pattern with splattered vintage speckles.
Source David Pomfret
Decorative divider 188 #2521
Dark CC 0From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
Escheresque Dark@2X #1065
Dark CC BY-SA 3.0A comeback for you: the popular Escheresque, now in black.
Source Patten
Background pattern 215 (colour 2) #2370
Blue CC 0A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Gray Striped Fabric Pattern #1170
Fabric CC BY-SA 3.0Here's a new gray "fabric" pattern. Use it as backgrounds for websites or for other purposes.
Source V. Hartikainen
Diagonal Waves #1006
Gray CC BY-SA 3.0It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Eight Horns #1325
Light CC BY-SA 3.0Looks like an old rug or a computer chip.
Source Patutin Sergey
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
Colourful background 14 #2526
Colorful CC 0A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin