If you are really lost, here are some interesting projects ..

ABC programme - Water quality testing, Green-based projects  

Eden School Project - Kine-static project (Arduino) 

GreenPac - Agriculture and Aquaculture 

Atmospheric Physics research - Solar Flares, Lightning etc (Raspberry Pi) 

Clean Water Competition - Water Filtration systems

Earthquake studies 

Green Building and Technology
Development of a Kinetic Art piece for Singapore Science Center