Wavy background #2018
Colorful CC 0CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
More Textures
Soft Pad@2X #614
Fabric CC BY-SA 3.0Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Fence 2 #2580
Wood CC 0A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Tessellation 11 (variant 3) #2536
Grid CC 0The original enhanced with one of Inkscapes's filters.
Source Firkin
Shattered #951
Gray CC BY-SA 3.0A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Decorative divider 252 #2065
Dark CC 0Remix from a drawing in 'Ostatnie chwile powstania styczniowego', Zygmunt Sulima, 1887.
Source Firkin
Dark Brown Leather Texture, Seamless Tile #1092
Leather CC BY-SA 3.0The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
Strange Bullseyes #865
Light CC BY-SA 3.0This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Paper Fibers #1060
Paper CC BY-SA 3.0Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Floral design #1984
Green CC 0Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Soft Kill #318
Dark CC BY-SA 3.0Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
Subtle Stripes #751
Stripes CC BY-SA 3.0Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Grey Washed Wall@2X #1129
Wall CC BY-SA 3.0This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Light & Boards #1297
Wood CC 0ZeroCC tileable wood boards texture, photographed and made by me. CC0
Source Sojan Janso
Hexabump #953
Dark CC BY-SA 3.0Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Background pattern 19 (black) #203
Dark CC 0A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Prismatic Hypnotic Pattern No Background #571
Noise CC 0Prismatic Hypnotic Pattern No Background
Source GDJ
Tex2res3@2X #724
Fabric CC BY-SA 3.0Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
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
Background pattern 117 #524
Noise CC 0A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
Abstract Tiled Background Extended 8 #519
Noise CC 0Abstract Tiled Background Extended 8
Source GDJ
Background pattern 308 (colour 2) #1871
Green CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Green Background With Leaves #1331
Green CC BY-SA 3.0It looks very nice I think.
Source V. Hartikainen
Retro Intro@2X #894
Gray CC BY-SA 3.0A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Embossed Paper #731
Paper CC BY-SA 3.0One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim