Thursday Challenge - BLUE

When the thursday challenge is blue, how can I miss that?   

So, it's blue as in house, water, vehicle, flower etc.  I looked through my archives and found a lot of pictures that matched this theme.  I've conciliated them to the final top 3.  

All these pictures were taken during the blue hour!  When I say blue, I couldn't resist talking about the blue Parisian beauty which I posted here...