>Is there a way to have the actual images list of MSN Messenger to be randomly displayed. Presently, I have to select one and that's the one which will be displayed until I change it again manually.

I haven't seen anyone doing this, but if it's been done, the guys over at http://www.mess.be/ will know about it.

FYI:
http://www.securityfocus.com/bid/14288

SecurityFocus on Saturday: MSN Messenger and Internet Explorer contain a security vulnerability in the way they process ICC Profiles embedded in images. When their header data is tampered with an attacker could crash both Microsoft software titles and possibly even execute malicious code on the victim's computer.

"The condition is likely due to an integer handling error. The author has stated that the crash observed was due to an access violation on a memory read attempt, possibly due to an out-of-bounds array access."

Both MSN Messenger 6 and 7 are vulnerable to the exploit, as well as most versions of Internet Explorer (check the list).