It is very easy to install new custom themes on your blackberry phones, here is a 5 step 5 minute process for you to install blackberry theme on your business phone.

1. Download the themes. If they are archived (most likely) extract them in a folder;
(As usual,be careful of your download sources).

2. Open Blackberry Desktop Manager and connect your Blackberry;

3. Enter the Application loader, click Next;

4. Hit the Add button, search the folder where you have the themes, select Themes.alx then click Next;

5. Click Next and wait for the program to load all the files;

6. Hurray!!! -New theme installed.