Let your BTC work for you at http://scrypt.cc?ref=baahQ
Its scrypt hashing, mines the most profitable alt coins and pays you back in BTC.

Difficulty fluctuates but is more stable than https://cex.io/r/1/jwl1278/0/
because it can switch to a different coin if difficuly goes up.

It can also take advantage of alt coin trends such as a coin suddenly getting hot for a few days.

Another good site is http://www.qoinpro.com/9248c367157ce323357e04db9b41821b
Its like a multicoin faucet/wallet that pays you BTC, LTC, FTC and more dailey with no action required by you.
You get your first deposit as soon as you sign up.