I don't know what type of movies you like or what you would like to watch, but some of my favorites to watch while high would have to be The Fountain, Donnie Darko, Run Lola Run, Les triplettes de Belleville, A Clockwork Orange, Vanilla Sky, ... Think that's about it.
The Fountain--One of my favorites, sober or high. About the search for the fountain of youth basically. There's so much more to it though. Couldn't recommend it more.
Donnie Darko--You're probably aware as to what it's about, but if not: It's basically about a teen plagued by visions of a demonic rabbit talking about the end of days.
Run Lola Run--It's a foreign film, so it's subtitled. Dunno if that's your thing, but the dubbed version sucks. Anyways, it's about a guy who's hired to do a drug deal for a drug dealer as a trial of his trust... He forgets the money on a train and has 30 minutes to come up with a way to get a few thousand dollars (forget the exact amount)... He calls his girlfriend, Lola, who tries to help him... The movie plays out four different scenarios. Highly suggested.
Les triplettes de Belleville--Another foreign film (surprise there, huh?), but it doesn't have subtitles... There are only a few spoken words in the entire movie but you don't need to understand them to understand the movie... It's animated and the animation is really unique. I highly suggest it.
A Clockwork Orange--Stanley Kubrick directed it. From the 1970s (I think). About a group of teens who go around breaking and entering peoples houses, raping women, etc. One of them is experimented on with this new procedure to make him sick every time he sees an act of violence. Very good movie.
Vanilla Sky--I have no vendettas against Tom Cruise and I think if you do you should set those aside and just watch this movie for what it is. I won't ruin it for you and tell you what it's really about, but watch it with an open mind.
I'm sorry if that was too much information for anybody to deal with, but I just figured I'd give ya a bit of info. on each of the movies...