Mining Options/Projects:
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Install a miner on your Raspberry Pi.
  • scrypt (Litecoin, Dogecoin, Feathercoin, etc..)
  • scrypt:N (Vertcoin [VTC])
  • sha256d (Bitcoin, Freicoin, Peercoin/PPCoin, Terracoin, etc..)
  • x11 (Darkcoin [DRK], Hirocoin, Limecoin)
  • x13 (Sherlockcoin, [ACE], [B2B], [GRC], [XHC], etc..)
  • x14 (X14, Webcoin [WEB])
  • x15 (RadianceCoin [RCE])
  • cryptonight (Bytecoin [BCN], Monero)
  • fresh (FreshCoin)
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Raspberry Pi, Single HDD
The Raspberry Pi can support 5v, 2.5A through it's USB ports which is suitable for 1x HDD as standard.
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A simple Burst mining rig.
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Raspberry Pi Multiple HDD
With the addition of a powered USB hub 4x HDDs can be supported. Try this simple and neat solution. It only uses 30W!
Data Farming Projects:
Some Crypto-Currencies reward users for "Hosting the Cloud". Store other peoples data and get paid for it!

The usual downside is to keep your Pc switched on 24/7, what a great solution the Raspberry Pi is!
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Sia Hosting/Node/Wallet, Raspberry Pi 64bit Gentoo OS,
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Storj Data Farming