His sparkline update hasn’t been merged into the Hubot repo yet, but you can view his fork. UPDATE – Merged!.
Sparklines in your Campfire chat room
We wanted to grab some of the graphics that Scout’s in-app page offers to users to provide us with visual feedback on historical norms for each metric without leaving the chat room. A call to Scout support got graphics ported into the API in less than a day, and we were off and running.