Most themes use the t-mobile theme engine (found in ROMs like CyanogenMod), these themes can be found on the play store (type cm10 theme). But custom launchers like Nova can have themes and icon packs and you're free mix match around
Look at the post your home screen thread over on themes and apps for inspiration
Sent from my Nexus 4 using xda app-developers app
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Nexus 4 8GB owner; running stock intime for
Key Lime Pie KitKat
For doing something extreme:
For when I'm not: