By accident or by design, Growl is most likely installed on your machine; if it isn’t, you should probably look into it. Many applications offer support for it and some even come bundled with it. Growl is one of those applications that one thinks should be native to OS X, but sadly, it isn’t. Though as Mountain Lion rolls out its own notification system, the future of Growl seems to be precarious. We’re still huge fans though and thought you’d enjoy a nice big dose of Growl goodness.
Here we have a group of sexy, sleek, and shiny Growl themes ready for you to download, install, and use at your discretion. At the bottom of the article, there are a few extra Growl notification styles that have not been coded. You can use these as inspiration. If you keep an eye on them, the designers may end up coding them.