I have a Mac, can I still install extra themes?
Having a Mac does not really limit you on installing themes.
The BEST way in your case would to be install them via OTA (Over The Air) if you have a data plan.
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Do I need to have a computer in order to get themes to work?
You do not need a computer to make the themes work. you can install directly to your BlackBerry if you have a data plan. If not, then you will need a PC to install the themes via Desktop Manager.