Once your inbox is organized with Labels and Filters, there are a few features in Gmail that can be added to further increase your email efficiency. These are all called Labs, and can be found by clicking on Settings, and then Labs. Find each Lab in the list and simply click on the "
Enable" radio button.
Custom Label Colors

This Lab will provide an array of colors to code your Labels. For example, you may want to code your Urgent folder red, and your Twitter folder light blue. To assign a color, click on the left arrow in front of the Label name and choose a color. By associating a color with a Label, you can quickly identify the Label you need.
Hide Read Labels

This Lab hides all of the Labels in your inbox until a new message arrives. Once a new message arrives and the filter places it in the designated Label, the Label will appear bold and show the number of messages in that Label. You can always click on “# more” to view all of your Labels if you need to access them. These will keep all of your Labels out of your peripheral vision, which is a distraction.
Superstars

This Lab allows you to code each message with different icons, such as a colored star, checkmark, or information icon. These coded messages will stand out in your inbox or in a Label. To code a message, just click on the empty star in front of the Sender’s name. Continue clicking until you reach the icon you want for that message. You can also search starred messages by clicking on “Starred” at the top of your inbox or in a specific Label. All messages with an icon will be highlighted.
These Labs will help you to quickly identify what type of messages arrive, what needs to be read immediately or later, and star important messages for quick indexing, saving time and increasing your email efficiency.