I have compiled the Mac OS X wallet binary for BillionCoin-Qt.  You can download the DMG for the wallet here: http://www.johnchapman.net/?ddownload=3886

I have a forked version of the BillionCoin project here with the adjustments for Qt 5.0 and OS X: https://github.com/chapmanjw/bil.  I have submitted a pull request if the developers would like to merge this into the main codebase.

http://www.johnchapman.net/wp-content/uploads/2014/03/bil3.png

http://www.johnchapman.net/wp-content/uploads/2014/03/bil2.png

http://www.johnchapman.net/wp-content/uploads/2014/03/bil1.png