Fetches, caches, and displays current cryptocurrency prices (bitcoin and litecoin, for now).
Yes, simply modify the included crypto-ticker.css file, located in the plugin's /css directory.
I may add the smaller altcoins in the future if there is enough interest. If you can't wait, adding them yourself should be a trivial task; just keep in mind that because of the way the btc-e API is set up, each additional currency means an additional request, which will impact performance on cache misses. If I do decide to add the other altcoins, I'll probably re-write the widget so that the requests are asynchronous.