Mo just let me know that Bplay has released a slick new FlowBerry theme to follow up on their ground breaking crossbar theme. The theme has a slick coverflow-like menu bar that just looks awesome. Sadly you can not configure the coverflow menu yourself but it does include: Messages, Calendar, Address Book, Media, SMS, BlackBerry Messenger, MemoPad, & Keyboard Lock. The top bar is very clean cut and the icons look very Mac-ish.
You can pick it up for $6.99 at Bplay for your 8100, 8300, & 8800 series device. Bplay recommends OS 4.3+ for optimal animation performance but they do say that it works with all device software.