Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!
Source V. Hartikainen
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.
Source V. Hartikainen
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight