"Polished Stone", Gray Background Pattern #1053
 Stone  CC BY-SA 3.0

A 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

 More Textures
Background pattern 225 (colour 2) #2326
 Yellow  CC 0

Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.

Source Firkin

Chequered dotted cat #2430
 Grid  CC 0

A chequered cat with polka dots and background.

Source Firkin

Retro Circles Background [email protected] #436
 Dark  CC 0

Retro Circles Background 8

Source GDJ

Repeating Web Background (Dark Brown) #1079
 Metal  CC BY-SA 3.0

This one has rusty dark brown texture.

Source V. Hartikainen

Background pattern 252 (colour) #2161
 Colorful  CC 0

Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Triangular ornament 32 #2435
 Dark  CC 0

Drawn in Paint.net using the kaleidoscope plug-in and vectorised.

Source Firkin

Iron Grip #587
 Dark  CC BY-SA 3.0

Sounds like something from World of Warcraft. Has to be good.

Source Tony Kinard

Old Map #1205
 Unknow  CC BY-SA 3.0

An interesting one. Lovely at 2X as well!

Source Andreas Föhl

Grunge For Surfaces 4 #1401
 Dark  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

[email protected] #1108
 Light  CC BY-SA 3.0

A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.

Source Dima Shiper

Diagmonds #336
 Dark  CC BY-SA 3.0

Love the style on this one, very fresh. Diagonal diamond pattern. Get it?

Source INS

Decorative divider 206 #2380
 Dark  CC 0

Derived from a corner decoration itself found as a jpg on Pixabay.

Source Firkin

Background pattern 208 (colour 2) #2462
 Grid  CC 0

A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Prismatic Octagonal [email protected] #440
 Noise  CC 0

Prismatic Octagonal Background

Source GDJ

Decorative divider 211 #2362
 Dark  CC 0

From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.

Source Firkin

Floors & Block #1598
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Colorful Floral Background 3 No [email protected] #486
 Light  CC 0

Colorful Floral Background 3 No Black

Source GDJ

Leaftrim #1683
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Wavy background #2016
 Pink  CC 0

A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic

Source Firkin

Blizzard #663
 Paper  CC BY-SA 3.0

This is so subtle I hope you can see it! Tweak at will.

Source Alexandre Naud

Raindrop-seamless pattern #2558
 Blue  CC 0

This is the remix of an OCAL clipart called "Rain on Window" uploaded by "pagarmidna".Thanks.This is a seamless pattern of raindrops.

Source Yamachem

Wallpaper Tile 13 #240
 Light  CC 0

An abstract Background pattern of purple twisty patterns.

Source TikiGiki

Egg Shell #861
 Light  CC BY-SA 3.0

It’s an egg, in the form of a pattern. This really is 2012.

Source Paul Phönixweiß

Background pattern 215 (colour 2) #2370
 Blue  CC 0

A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.

Source Firkin

3D Wood #1475
 Wood  CC 0

Basket Fibers, Basket Texture, Braid Background style CC0 texture.

Source 1A-Photoshop

Little Pluses #73
 Light  CC BY-SA 3.0

Subtle grunge and many little pluses on top.

Source Atle Mo

Floors & Black #1608
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Dimension #1173
 Light  CC BY-SA 3.0

Don’t look at this one too long if you’re high on something.

Source Luuk van Baars

Starting Diamond Shape #137
 Light  CC BY-SA 3.0

Simple blue and line to mix.

Source SliverKnight