One of the best parts of the Sourcery Rom series is the dedicated theme developers that support this Rom! While most theme developers have altogether stopped developing for a specific rom and have mostly moved to supporting the CM10 Theme chooser you can still find totally unique themes for the Sourcery Rom! The latest by theme dev "johnnyb15613" Black Majik 4.1 is a basic inverted theme with some enhancements that give it a unique look different from a purely stock android look and feel! You can grab this theme from the sourcery toolbox. He has even put together a Black Notifications pulldown wallpaper, and wallpaper app in the toolbox that match this theme.
Themed elements include framework, apex launcher, browser, calculator, contacts, email, gmail, googleloginservice, latinimegoogle, mms, phone, playstore, settings, setupwizard, systemui, talk and more! Apollo, google now, and dropbox will be themed in the next build! This theme looks pretty solid and will give your phone a whole new look and feel!
More info and discussion here