Check out this thread. It relates to snowfall but confetti isn't hugely different. I have not delved into it too deeply but You can control the effect to some degree. I did not see any color control and the filter effects does not colorize it. But it could be a starting point (or if white confetti does the job you're set).
Here is @h_classen's Hype demo from that thread using "snowfall.min.js" library:
snowsnow.hype.zip (140.5 KB)
EDIT: Google "three.js particle effects" - this looks promising - but no experience with it.