I created a CruiseControl.net plugin with it. Had some issues with the default API because it is not that good documented, so needed a lot of experimenting. Furthermore it is not that easy to develop to the default API.
So i made an .net API (c#) which abstracts the violet api away and gives you more help while developing, specially while creating choreographys (pain in butt they are Yoda would say).
Currently both are not available to the general public but i am in the process of releasing.
Things that can be neath to implement on your bunny, i don't know, local traffic information (nice to have) new releases for music you like, interfacing with your phone? (send command from phone to bunny)