One of the more trivial, but fun, features of PHPBB is that the message board can be displayed in several different styles. You can choose your favorite style and set that to be your default when you log in. This is the "board style" option in your profile. Currently everyone has only one choice: "subSilver."
Is there any interest in being able to personallize the display of the board this way? Vote in the poll associated with this post.