Look mum! No images!
This image was generated through the Google Charts API. Just copy and paste the following text
http://chart.apis.google.com/chart?cht=p3&chd=t:10,10,20,30,30&chs=240x90&chl=Hello|World|How|Are|You
into your browser to see it in action.
The best part is that it supports sparklines as easily as this.