I can mostly think of shorter stuff when it comes to experimental anime though. Lots of the older shorts, anthologies like Robot Carnival, Sweat Punch, Genius Party, Mix Juice, Anime Mirai, Short Peace come to mind as well as just shorts/short movies like Maison en Petits Cubes, The Diary of Tortov Roddle, Trava, Ani*Kuri, Cat Soup, Glassy Ocean, Spring & Chaos, Inaka Isha, Eternal Family, Iblard Jikan etc....
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These come to mind:
http://myanimelist.net/anime/885/Tenshi_no_Tamago
http://myanimelist.net/anime/2755/Cleopatra
http://myanimelist.net/anime/5924/Koushoku_Ichidai_Otoko
http://myanimelist.net/anime/3914/1001_Nights
And Tezuka stuff is also fun:
I can mostly think of shorter stuff when it comes to experimental anime though. Lots of the older shorts, anthologies like Robot Carnival, Sweat Punch, Genius Party, Mix Juice, Anime Mirai, Short Peace come to mind as well as just shorts/short movies like Maison en Petits Cubes, The Diary of Tortov Roddle, Trava, Ani*Kuri, Cat Soup, Glassy Ocean, Spring & Chaos, Inaka Isha, Eternal Family, Iblard Jikan etc....
You might also be interested in this:
http://i.imgur.com/peTdthI.jpg
Though it's not really all experimental (or good for that matter). But it does collect a lot of stuff that might qualify.
If you're also interested in live action movies I recently found this 'guide' that might also prove useful to you:
https://img.4plebs.org/boards/tv/image/1365/39/1365390545804.jpg
Hope I could help. Good day!
Miss you!