Post em'. They don't need to be official, and AMVs are also acceptable.

http://www.youtube.com/watch?v=I8KGHatrPWE

http://www.youtube.com/watch?v=aYDfwUJzYQg

http://www.youtube.com/watch?v=hglVqACd1C8 (There isn't a Tool video I don't like, but this one is my favorite.)

http://www.youtube.com/watch?v=2zt09A-Xd7o

That's all I could think up at the moment.

I though the somebody that I used to know video by GOTYE was actually quite interesting.

This one is pretty weird;

http://www.youtube.com/watch?v=8t0GRH3yoiI

I don't watch music videos anymore, but i used to back when I listened to a lot of White Stripes. They've got some cool ones.

http://www.youtube.com/watch?v=gLESpHrtvxs

http://www.youtube.com/watch?v=FU7bFpPJiww is one of the best ever.

http://www.youtube.com/watch?v=qLrnkK2YEcE

Watch it.

I don't watch them that often, but here are a couple of AMVs that I particularly like.

http://www.youtube.com/watch?v=450_FqgsuXE
http://www.youtube.com/watch?v=qiq3pRAH8Qc

http://www.youtube.com/watch?v=HTN6Du3MCgI

My only addition would be http://www.youtube.com/watch?v=kDWgsQhbaqU (because it is just awesome) or http://www.youtube.com/watch?v=uhSYbRiYwTY (because it is, well, David Bowie).