Under utilized Spark Pi cluster

Feeling a bit sad I’ve not really given my spark cluster alot to do. I bought it with greater intentions of doing some quite cool ideas on data analytics and computational modelling of large datasets from various live streams.
Think i will reserve some dedicated time to the research parts of my work outside the academics I’m doing, as eventually I’m sure the two will combine.
In the mean time, poor spark-cluster is looking a bit sad..