LTC or BTC mining is useless, these coins are owned by ASICs and you won't get any profit with Acorns.
we're not getting any kind of a profit from the current alt coins, at least you would be able to easily exchange your litecoin or bitcoin pennies from exchanges, then having to wade through the garbage exchanges that run Zen Protocol or Denarius.
Even the cheap free EazyMiner had a Bitcoin/Litecoin miner built into it and I messed around with that when I knew very little about mining and all I had was a Core i5 with a cheap Radeon HD8350 GPU, so I primarily mined LTC to f2pool and made a measly 0.00000792. Now if a CPU could do that, certainly a FPGA could do better than that with LTC.