I'm a newbie here, but I was pointed to a neat little trick that I wanted to share - thanks to my IT dept! This will likely work on other models but as also shown in my sig, I wanted to indicate what I am using personally.
I got a diagonal series of (selected color)/white lines of background behind the text on inbox messages from the source I selected. This gives me a quick ID of messages I get from work as opposed to those from Yahoo, etc...
Before posting this I searched to see if someone else had posted it. Finding no such post, I forward:
"Verify that your BlackBerry® device is associated with an email account that uses a BlackBerry Enterprise Server.
1. In the device options, click Security Options.
2. Click General Settings.
3. Perform any of the following actions:
• To set a background color for email messages that are sent to your device through a BlackBerry Enterprise Server, set the Enterprise Messages.
• To set a background color for messages that are not sent to your device through a BlackBerry Enterprise Server, set the Other Messages.
4. Press the Menu key.
5. Click Save.
Note: PIN messages might use the background color that you have set for work email messages. Contact your system administrator for more information."