(4) Adding your own (blinking and clickable) private messages images
(description)
On the index page of your forum, there is a box that says "Private Messages" with an default vBulletin on/off icon and the message if there are any messages and/or how many there are unread/total.
This hack does two things to this box:
1- Lets you use your own on/off image-icons
2- Makes the icon clickable which feels more 'natrual'.
(Please note that I did not include the .gif images, if you want to use the images I use, please download them from: here!)