Well it could be like a continuos fireworks since fireworks doesn't really stay there its just like an explosion but I get your point so I apologise for this "rubbish" (quote courtesy of cctv) suggestion
"They are especially effective in igniting burnouts or backburns in very dry conditions, but not so effective when fuel conditions are moist' and they can be used in the ignition of controlled fires
Hey I couldn't think of one so I just simply looked up a use even if its irrelevant atleast its a use other then signalling which would be even more pointless