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JB in AZ
Android Expert
Re-flashing the custom ROM through recovery will bring it back to the un-themed version. Make a nandroid backup before doing this, just to be safe.
+1 Remember that you shouldn't need to wipe anything if you are reflashing the same ROM. You can also make a Nandroid backup before you start modding and re-install the backup if you no longer want customizations.
LBPHeretic
Android Expert
I agree, technically should not have to wipe anything when flashing the same ROM over the current ROM. I would, just in case, wipe cache and Dalvik cache anyway. 
It might just be one of my many self imposed rules, but I have always had good luck doing that. Feel free to not do it though if you do not feel like it.
It might just be one of my many self imposed rules, but I have always had good luck doing that. Feel free to not do it though if you do not feel like it.
andygu3
Android Expert
I agree, technically should not have to wipe anything when flashing the same ROM over the current ROM. I would, just in case, wipe cache and Dalvik cache anyway.
It might just be one of my many self imposed rules, but I have always had good luck doing that. Feel free to not do it though if you do not feel like it.
+1 to wiping Dalvik cache and cache
I would always recommend wiping both, even if you are reflashing the same rom