SeuratJS is a plugin for the powerful Raphaël that enables us to create vivid animations and pixelated artwork.
It extracts the color information from any given image and rebuilds it in SVG with the modifications applied.
The plugin works cross-browser and can be customized with various settings (like the shape of the brush being used to re-generate images).
Compatibility: All Major Browsers
Kaliber10000 has a huge collection of free pixel patterns.
There are currently 900+ free patterns that can be previewed & browsed easily.
Some patterns in the collection are limited to non-commercial use or some may require a link back. They are mentioned very clearly for every pattern.