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.
Yes! Version 1.2 allows you to enter your Coinbase referral ID in the widget settings. Please note that if you don't have your own referral ID, a default one will be used.