Light Gray #1203
Gray CC BY-SA 3.0Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
More Textures
Textured Orange Stripe Pattern #997
Stripes CC BY-SA 3.0A textured orange background pattern with vertical stripes.
Source V. Hartikainen
Dark Wood #320
Wood CC BY-SA 3.0A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Hexellence #705
Light CC BY-SA 3.0Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
Decorative divider 212 #2343
Dark CC 0Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Diamond pattern #2285
Brown CC 0From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Background pattern 336 (colour 3) #1719
Blue CC 0Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin
Prismatic Curved Diamond Pattern 8 No Background #549
Dark CC 0Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Background pattern 215 #2371
Brown CC 0A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Rocky Wall@2X #42
Light CC BY-SA 3.0High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Prismatic Groovy Concentric Background 3 No Black@2X #460
Noise CC 0Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Square ornament 37 #2177
Dark CC 0Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Smooth Wall@2X #28
Light CC BY-SA 3.0Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Wavy background #2021
Pink CC 0CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
"Polished Stone", Gray Background Pattern #1053
Stone CC BY-SA 3.0A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
Light Honeycomb #59
Light CC BY-SA 3.0Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Candyhole@2X #357
Light CC BY-SA 3.0It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
Vertical Cloth #597
Dark CC BY-SA 3.0You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Tessellation 11 (variant 3) #2536
Grid CC 0The original enhanced with one of Inkscapes's filters.
Source Firkin
Decorative divider 299 #1743
Dark CC 0From a drawing in 'Bond Slaves. The story of a struggle.', Isabella Varley, 1893.
Source Firkin
Little Triangles@2X #688
Light CC BY-SA 3.0The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Fake Luxury@2X #622
Diamond CC BY-SA 3.0Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Decorative divider 193 #2502
Dark CC 0From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Background pattern 308 (colour 3) #1870
Colorful CC 0Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin