Wood@2X #50
Wood CC BY-SA 3.0Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
More Textures
Subtle Orange Emboss #97
Light CC BY-SA 3.0A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
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
Connected@2X #349
Light CC BY-SA 3.0White circles connecting on a light gray background.
Source Mark Collins
SubtleNet@2X #856
Light CC BY-SA 3.0You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Decorative divider 208 #2366
Dark CC 0Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Fabric 1@2X #10
Light CC BY-SA 3.0Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Green Fibers #91
Dark CC BY-SA 3.0The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Decorative divider 215 #2242
Dark CC 0Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Diamond pattern 2 (colour 6) #2261
Colorful CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
blue wave-seigaiha #2535
Blue CC 0The image depicts the Japanese Edo pattern called "seigaiha" or "青海波" meaning "blue -sea- wave".I hope it's suitable for the summer season.
Source Yamachem
Cartographer #749
Dark CC BY-SA 3.0A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Decorative divider 288 #1820
Dark CC 0From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Diamond pattern (colour 6) #2280
Yellow CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Triangular Background Design Mark II 5 #406
Dark CC 0Prismatic Triangular Background Design Mark II 5
Source GDJ
Decorative divider 241 #2084
Dark CC 0From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Climpek@2X #776
Grid CC BY-SA 3.0Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Floral background 11 #2044
Dark CC 0Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.
Source Firkin