I made this rainmeter script a while back. I don't really use it anymore but it should still function and a few people have taken to it and made it their own. It's a bit messy but ends up being a bit faster with the clutter/code set up this way.
Here's an old preview screenshot of it alongside bbleanbar and Oscuro (windows 7 visual style). Full description and download here for those interested: http://fav.me/d5v6u67
I'm hoping something like this is fully possible directly within blackbox at some point, however I'm not too well versed with bbinterface and limitations with unicode support have discouraged any attempt at exploration.