Pattern #1476
Paper CC 0Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
More Textures
Leafy pattern 12 #1764
Dark CC 0From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
meshed silhouette-omnibus #2484
Brown CC 0The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
Triangular@2X #1157
Gray CC BY-SA 3.0Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Background pattern 268 #2066
Dark CC 0Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Colourful background #2010
Colorful CC 0Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Diagonal Striped Brick@2X #680
Stripes CC BY-SA 3.0Might not be super subtle, but quite original in its form.
Source Alex Smith
Decorative divider 211 #2362
Dark CC 0From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Background pattern 214 (colour 4) #2373
Yellow CC 0A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Notebook #1178
Gray CC BY-SA 3.0This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
"Polished Stone", Gray Background Pattern #1053
Stone CC BY-SA 3.0A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
Seed #1289
Wall CC 0Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
"Rusted Metal", Grunge Background #1087
Metal CC BY-SA 3.0A rusty grunge background for websites. Feel free to use it in your site's theme.
Source V. Hartikainen