Wavy background #2022
Blue CC 0CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
More Textures
Background pattern green #1953
Green CC 0To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Ice Age@2X #638
Paper CC BY-SA 3.0I asked Gjermund if he could make a pattern for us – result!
Source Gjermund Gustavsen
Txture #757
Dark CC BY-SA 3.0Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Tessellation 15 (colour 4) #2219
Green CC 0The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Tile-able Black Paper Background #1076
Paper CC BY-SA 3.0A black tile-able background with paper-like texture.
Source V. Hartikainen
Mix Stone #1298
Stone CC 0ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
"Black Metal Grid", Seamless Background Pattern #1080
Metal CC BY-SA 3.0A free seamless background pattern for use on websites.
Source V. Hartikainen
Prismatic Groovy Concentric Background 2@2X #454
Noise CC 0Prismatic Groovy Concentric Background 2
Source GDJ
Background pattern 232 #2297
Dark CC 0Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
Background pattern 255 (colour 2) #2140
Brown CC 0Colour version of the original pattern.
Source Firkin
Escheresque Dark@2X #1065
Dark CC BY-SA 3.0A comeback for you: the popular Escheresque, now in black.
Source Patten
Prismatic Groovy Concentric Background #449
Noise CC 0Prismatic Groovy Concentric Background
Source GDJ
Background pattern 227 (colour 2) #2313
Blue CC 0A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Blue #1264
Paper CC 0Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Pyramid@2X #896
Light CC BY-SA 3.0Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
Retro Intro #893
Gray CC BY-SA 3.0A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Lead glass tile #2048
Colorful CC 0Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
Floral design 98 (colour) #1781
Green CC 0From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Pixel Weave #1154
Unknow CC BY-SA 3.0Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran