Background pattern 254 #2144
Dark CC 0To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
More Textures
Circles pattern #1917
Yellow CC 0Fix side and a seamless pattern formed from circles.
Source SliverKnight
Background pattern 215 (colour 3) #2369
Pink CC 0A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Green Fibers@2X #92
Dark CC BY-SA 3.0The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Crisp Paper Ruffles #841
Light CC BY-SA 3.0Sort of reminds me of those old house wallpapers.
Source Tish
Brilliant@2X #754
Light CC BY-SA 3.0This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Background pattern 315 (colour 6) #1840
Green CC 0The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Blue Wallpaper For Websites #910
Stripes CC BY-SA 3.0A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
Escheresque Dark@2X #1065
Dark CC BY-SA 3.0A comeback for you: the popular Escheresque, now in black.
Source Patten
Decorative divider 219 #2231
Dark CC 0Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Decorative divider 205 #2381
Dark CC 0Derived from a corner decoration itself found as a jpg on Pixabay.
Source Firkin
Prismatic Abstract Line Art Pattern Background 2@2X #568
Dark CC 0Prismatic Abstract Line Art Pattern Background 2
Source GDJ
Project Papper #119
Paper CC BY-SA 3.0Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Page ornament #1992
Dark CC 0Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Plywood Web Background #871
Wood CC BY-SA 3.0Plywood Web Background background image for use in web design.
Source V. Hartikainen
Mirrored Squares@2X #124
Dark CC BY-SA 3.0Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Triangular #1156
Gray CC BY-SA 3.0Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Stacked Circles@2X #674
Light CC BY-SA 3.0A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Page ornament 29 #2307
Red CC 0From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin