Suchflex has begun distributing Bitcoin full nodes: https://keepingstock.net/easiest-way-to-run-a-bitcoin-full-node-91b7687af853#.e6c87cwuu

A full node BOINC project could be for all the supported cryptocurrencies in project rain (36 cryptos).

More info: https://steemit.com/bitcoin/@gridcoinman/suchflex-s-distributed-computing-app-to-incentivize-operators-of-full-bitcoin-nodes-core-unlimited-classic-xt