Background pattern 272 (colour 3) #2055
Red CC 0A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
More Textures
Swirl@2X #948
Light CC BY-SA 3.0The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Concrete #1361
Wall CC 0Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Criss-cross pattern #1895
Dark CC 0A criss-cross pattern similar to one I saw mown into a sports field.
Source Firkin
Decorative divider 292 #1774
Dark CC 0From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Dimension #1173
Light CC BY-SA 3.0Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Background pattern 250 (colour 4) #2168
Blue CC 0To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Pinetree in tortoiseshell(亀甲松) #2538
Dark CC 0The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
Rough Fabric Pattern (Dark Brown) #1166
Fabric CC BY-SA 3.0A background pattern with a look of rough fabric.
Source V. Hartikainen
Olive Green Web Background Image #1335
Green CC BY-SA 3.0Seamless Olive Green Web Background Image
Source V. Hartikainen
Zodiac pattern (black background) #267
Dark CC 0A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
Classy Fabric@2X #612
Dark CC BY-SA 3.0This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Prismatic Groovy Concentric Background 4 #461
Noise CC 0Prismatic Groovy Concentric Background 4
Source GDJ
Tessellation 16 (colour 4) #2212
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
Background pattern 8 (black) #209
Dark CC 0Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Background pattern 15 #201
Dark CC 0A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.
Source Firkin
Background pattern 214 #2377
Blue CC 0A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
"Dark Brick Wall", Background Pattern #1024
Stone CC BY-SA 3.0Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen