The problem we have with flares is the fact that they are predominantly red - hardly relevant is it?
As they are primarily for boats in distress at sea - a blue flare is pretty useless at attracting attention against a blue sea and a blue sky.
Blue smoke bombs aer an options but every one within a 20 metre radius will end us looking like Papa Smurf so they're not idea either.
How about going "old school" and getting as many as possible to wear blue and white - I know the cool kids in their designer jumpers won't be happy, but 45 thousand jumping around in blue would look amazing.