I'm no expert in fans but here some suggestions...
For some blue fans...
Newegg.ca - COOLER MASTER R4-L2S-122B-GP 120mm 4 BLUE LED LED Case Fan
If you don't mind swapping out the blue one's currently in the CM690II Advanced for red ones or adding in red with the blue for a mixed lighting job then these have better rated airflow...
Newegg.ca - COOLER MASTER R4-L2R-20CR-GP 120mm Red LED Case Fan