Ok, I have no idea which videos you have seen so I'm going to pretend you haven't seen any)
The band currently has 30 original PV's and some versions so I chose 12 that I consider to be the best in terms of both music and the video. I included some comments in hopes of making it more interesting and of course - chronological order!)
The download links are at the end.VelvetIt was probably the first PV I saw and it's a good starting point. The song is fast and powerful and the video is flashy and enticing. It's brimming with younthful energy since at the time the composer was only 20. Also Shou sings lower than usual creating an unforgettable effect for those who are new to the band)
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Fantasy
Another song that went to my player straight on and became a permanent resident there. The lyrics are very beautiful. They speak of losing a friend but the song itself is full of life. The video is quite simple and colourless compared to their other works but it fits the song perfectly.
Shunkashuutou
This video was shot early on but wasn't released until a few years after which made the fans go crazy. Why? It features boys in school uniforms)
Morale of the PV: don't waste your time at school, go make a rock band! Fun fact: in the PV everyone except Nao can't be bothered to study. This pretty much reflects how things really were for the band members since Hiroto dropped out of high school while Tora and Saga were very reluctant to finish it.
Eraser ~Memoire d'une fleur
I'm not too fond of the song actually but the video is very beautiful. "Boys over flowers" is the theme~ Shou with blue hair looks like he just stepped out of shoujo manga. The PV is bright and upbeat and I love to play it on sunny mornings.
Gekkou Yoku
The PV was released to promote the Alice in Pictures DVD. It's very simple with cheap graphics background and casual clothes but that serves to not distract attention from the boys themselves who look mighty fine. The song is also very bright and energetic.
The main highlight: Shou's pink/yellow make-up!)
RAINBOWS
Rainbows is a real classic. It was a great shifting moment for the band both music and style-vise. I wish I'd seen the uproar it caused in the fandom at the moment. I myself went WTF? when I saw it but eventually I grew to love it. The main highlight: Shou's leopard-print pants.
Hana
The PV became known as the Alice9 Channel PV. That was because they played it on the show for a whole year since they didn't release any new PV's. The PV also marked the band's name change or rather the spelling of name change as they reached their 5th anniversary. The song has awesome guitar solos and an oriental feel or so Shou claims)
Senkou
The fast catchy song soon became one of my favourites. I only wish I didn't look up the lyrics but nevermind. The PV is flashy and sparkling since the title translates to 'flash'. The main highlight: Shou's swarowski-embedded eye-patch.
The Beautiful Name
A very beautiful PV and a very beautiful song. I have no more to say.
SLEEPWALKER
This here is one of my absolute favourites. It's so classic, J-Rock at its best. The song is amazing and I consider it among the best in terms of music quality, it has so many layers and undertones. The video is also very beautiful. The imagery was inspired by Chernobyl.
GEMINI-0-eternal
The title track from the band's 4th album, it shows the band's maturity both in terms of music and visual style. Actually this PV is just for the 1st part of the song which is a trilogy. In full it is perhaps my favouritest song of theirs.
BLUE FLAME
This song actually has two PV's or rather two versions of it - Type A and Type B. Type B has more of the 'plot' while A has scenes of the band playing. Either way the PV is very pretty. The concept is something like this: the band disbanded and everyone is trying to cope with it. Nao has a fit of rage, Tora cries and Saga's become a junky?
All the band's PV's in excellent quality here:
http://www.mediafire.com/?hg7wp9swx2113