http://www.krank.us/FireSprite.html
FireSprite is an organic data visualization widget for looking at overdue and completed actions. It interfaces with the OmniFocus application. The more actions you complete in a 24 hour period in OmniFocus, the more sprites will appear. If there is time in the estimated time field when the action is completed, the widget will increase the number of sprites. If you have overdue items, a fire begins burning and chases away the sprites. When you put out the fire (by completing all overdue tasks) the widget will begin counting completed actions from the time the fire was put out.