Wavy background #2019
Colorful CC 0CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
More Textures
Floral design #1985
Dark CC 0Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Green Fibers #91
Dark CC BY-SA 3.0The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
White Sand #19
Light CC BY-SA 3.0Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Back Pattern #945
Light CC BY-SA 3.0Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Background pattern 309 (colour 3) #1864
Red CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Solid #845
Gray CC BY-SA 3.0A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
Circles@2X #186
Light CC BY-SA 3.0One more sharp little tile for you. Subtle circles this time.
Source Blunia
Soft Pad@2X #614
Fabric CC BY-SA 3.0Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Vintage Speckles@2X #654
Wall CC BY-SA 3.0Lovely pattern with splattered vintage speckles.
Source David Pomfret
Background pattern 226 (colour 6) #2316
Pink CC 0A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Floral background #1981
Dark CC 0Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
Bamboo Background Pattern #1330
Green CC BY-SA 3.0This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Small Crosses@2X #116
Stripes CC BY-SA 3.0Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
Background pattern 215 (colour 2) #2370
Blue CC 0A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
White Leather@2X #640
Fabric CC BY-SA 3.0I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Tessellation 11 (variant 2) #2539
Grid CC 0The original enhanced with some gradients.
Source Firkin
Square ornament 31 #2434
Dark CC 0Drawn in Paint.net using the kaleidoscope plug-in and vectorised.
Source Firkin
Glassy Orange Pattern #1315
Orange CC BY-SA 3.0This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
Tileable Off-white Background #1191
Concrete CC BY-SA 3.0A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
White Linen #839
Light CC BY-SA 3.0Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Background pattern 226 (colour 2) #2320
Green CC 0A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Corrugation@2X #766
Light CC BY-SA 3.0The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Colorful Floral Background No Black@2X #482
Light CC 0Colorful Floral Background No Black
Source GDJ