Gdash (https://github.com/ripienaar/gdash) is a dashboard UI for displaying Graphite (http://graphite.wikidot.com/) dashboards. It's Sinatra-based, config-management friendly, and a great way to create wallboards and simple, drill-down dashboards.
Check out the demo Gdash install at http://gdash.nickstielau.com/
Check out the graph template definitions at https://github.com/nstielau/gdash_demo.
Also, check out the wallboard mode: http://gdash.nickstielau.com/bunch/randoms/full/3/
Thanks to ripienaar for getting Gdash out there.
Let me know if there's anything else you'd like to see. Pull requests welcome ;)