Sometimes the simple white background in Google Reader gets to be a little monotonous. Now you can add colored borders or completely color in the entries to make them stand out better.
Once you have installed the script go to Google Reader’s settings and select the Preferences Tab. At the bottom you will see a new Colors Section where you can select the options that best suit your needs. For our example we deselected the Entry Body option and selected for Entry Frames instead. As seen here entries that are marked as Read will appear lighter in color.
Note: The colors are derived from the titles of the feeds.
Google Reader – Colorful List View [Userscripts.org]