Background pattern 306 (colour 6) #1878
Colorful CC 0Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
More Textures
Concrete Wall@2X #78
Wall CC BY-SA 3.0Dark blue concrete wall with some small dust spots.
Source Atle Mo
Fruit on a branch #1967
Dark CC 0From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Background pattern 308 #1872
Yellow CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Aged Grid Paper Background #1072
Paper CC BY-SA 3.0A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 2 No Background #538
Diamond CC 0Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
polka dot seamless pattern #2531
Light CC 0The image depicts polka dot seamless pattern.
Source Yamachem
White Wall@2X #772
Wall CC BY-SA 3.0A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Robots@2X #126
Dark CC BY-SA 3.0And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Fabric pattern 3 (colour 5) #2383
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
Dark Brick Wall #135
Wall CC BY-SA 3.0Black brick wall pattern. Brick your site up!
Source Alex Parker
Leafy design 18 #1788
Dark CC 0From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Diagonal Waves@2X #1007
Gray CC BY-SA 3.0It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Paper 2@2X #22
Paper CC BY-SA 3.0New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
Wavy background #2020
Green CC 0CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Square ornament 37 #2177
Dark CC 0Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Grey Washed Wall #1128
Wall CC BY-SA 3.0This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Nistri@2X #774
Stripes CC BY-SA 3.0No idea what Nistri means, but it’s a crisp little pattern nonetheless.
Source Markus Reiter
GPlay #735
Light CC BY-SA 3.0A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra