I've done some more sentence mining from lyrics. They have a great thing about them. They are "free". They were already memorized. They are nice to repeat - as long you like the song.
But they are few and they are skinny.
Same for anime sentences. They are too skinny. By skinny I say: Short, few kanji, hard to know how to write, etc.
But that lead me to another way of doing the sentences. What I'm doing now:
When I hear a new word, I put it in Yahoo和英辞書 and mine sentences for it.
Then I do the repetitions.
If I find a word that I'm not confortable with, I put it in Yahoo和英辞書 again and I get some more sentences.
I do that until I'm tired.
It is working fine. I already told why I like Yahoo dict sentences, but I'll say it again. They are thick, they are heavy, they have the exact amount of kanji, the have the exact amount of new words, a certain degree of irony and a lot of culture.