You can store anything you like in Cassandra. The type of data is not relevant as there are no types in Cassandra, they all get stored as byte arrays. The only relevant limit is a column value cannot exceed 2GB (see http://wiki.apache.org/cassandra/CassandraLimitations).
In terms of how: you just write the data like any other field. If you are new to NOSQL I would go and look at the Hector API and examples: https://github.com/rantav/hector
