Some old, some new, but all are excellent movies.

1. La Science des Reves (The science of the dreams in English) by Michel Gondry (2006)
URL: http://www.imdb.com/title/tt0354899/

2. Eternal Sunshine of the Spotless Mind by Michel Gondry (2004)
URL: http://www.imdb.com/title/tt0338013/

3. Waking Life by Richard Linklater (2001). He just released 2 new movies last year, but I didn't get the chance to watch them (yet)
URL: http://www.imdb.com/title/tt0243017/