"Beige Stone", Seamless Web Texture #1031
Stone CC BY-SA 3.0It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
More Textures
Geometric pattern 6 #1930
Dark CC 0To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dark Circles@2X #307
Dark CC BY-SA 3.0People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
45-Degree Fabric #1
Fabric CC BY-SA 3.0Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Decking #2585
Wood CC 0A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Ribbon pattern 2 (version 2, colour 4) #2036
Colorful CC 0The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Wallpaper Tile 13 #240
Light CC 0An abstract Background pattern of purple twisty patterns.
Source TikiGiki
Prismatic Curved Diamond Pattern 4 No Background #541
Diamond CC 0Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
Background pattern 245 (colour 6) #2187
Colorful CC 0This was formed by distorting an image of a background on Pixabay.
Source Firkin
Wavy background #2021
Pink CC 0CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Flower 193 #1794
Green CC 0From a drawing in 'Prose and Verse ', William Linton, 1836.
Source Firkin
Floral background 7 #2225
Yellow CC 0A floral background formed from numerous clones of flower 117.
Source Firkin
Subtle Orange Emboss #97
Light CC BY-SA 3.0A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Bark #1288
Wall CC 0Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
Background pattern 266 #2068
Dark CC 0Remixed from a drawing in 'Some account of the Worshipful Company of Ironmongers', John Nicholl, 1866.
Source Firkin
Light Paper Fibers@2X #836
Paper CC BY-SA 3.0More in the paper realm, this time with fibers.
Source Jorge Fuentes
Diamond pattern (colour 2) #2284
Green CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Background patter 294 #1920
Dark CC 0Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.
Source Firkin
Heart and rose pattern #2419
Pink CC 0Seamless pattern formed from a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Background pattern purple #1952
Colorful CC 0To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Fabric pattern 3 #2387
Fabric CC 0Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Arches@2X #716
Light CC BY-SA 3.0One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
seigaiha subtle color #2278
Pink CC 0This is a remix of "blue wave-seigaiha".I hope this subtle color version of Seigaiha would be suitable for background .
Source Yamachem
Background pattern 331 (version 2) #1745
Pink CC 0Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
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