Google Chart API / Infographics

http://code.google.com/apis/chart/infographics/docs/overview.html

QR code for "Hello world"
https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=Hello%20world

https://chart.googleapis.com/chart?chst=d_bubble_icon_text_small&chld=ski|bb|Wheeee!|FFFFFF|000000

Google Image Chart
https://chart.googleapis.com/chart?chs=250x100&chd=t:60,40&cht=p3&chl=Hello|World

Cytoscape custom graphic pass-through mapper
http://proteomics-ms.blogspot.com/2011/07/custom-graphics-for-node-in-cytoscape.html