Diceware is a mechanism for creating strong, easy to remember passphrases.
I think my urandom + SHA-256 + Mersenne Twister approach to randomness
makes sense, but anything security related is best viewed by peers.
For now, you'll have to clone the repo. If there's interest, I'll upload it to pypi and make it pipsi-friendly.
$ git clone https://github.com/jwatson/diceware.git
$ cd diceware
$ curl -O http://world.std.com/%7Ereinhold/diceware.wordlist.asc
$ python wordlist_converter.py diceware.wordlist.asc dicewords.json
$ python dicegen.py dicewords.json 7 10