Can Someone Recommend Me Some Anime....

So basically, I'd like to know some short anime (around 5-15 eps, shorter even). I don't mind but I don't watch Hentai or over the top Ecchi. I can list a few series I've seen but I won't put them all because I don't really care if they've been renamed.
-Serial Experiments Lain
-Baka & Test
-WATAMOTE
-School Days