I\'m going to be doing a talk at Code Camp in Philly soon on Continuous Integration. I have no experience with lava lamps, ambient orbs, or whatever - but I think that would be
This article provides a discussion and the code to output Cruise Control build status via serial or USB. The parts are cheap and it doesn't look too difficult to put together.
If you've got Linux people (maybe less likely in an MS shop) they might like the tux droid
Tux Droid http://www.kysoh.com/media-en/img-2873.jpg
There is an Nabaztag Plugin for Hudson and Nabaztag is IMO the easiest solution.
For Lava Lamps, you'll need a bit of stuff as detailed in Hudson Build Status Lava Lamps but it seems pretty easy.
Finally, you might want to check the DIYOrb entry on Kohsuke's blog.
The lavalamp from Pragmatic automation is my favorite.
What I have ended up with is a great, very easy to setup and use x10 solution. You can get the whole setup from agiletoys.com. These guys are great to work with and provide help if you need. But honestly it was very easy:
1) Buy their package. 2) Setup cctray. 3) Break a build and see the lights go off :)
Since it's x10, you don't need any wifi or network or subscription or anything. You will need a serial port. In my case I only had USB, so I used the USB-Serial converter from IOGear and it works just fine under Windows 2008 64bit (using their Vista 64 drivers you have to download).
Nabaztagtag rabbit rocks. It has a nice API and looks good.
Or a Build Wallboard.