Start by stretching out the straws as far as they can go and group them together in your hand. Spread out the top of the straws so they are sticking out. Have someone put a piece of tape around the bottom of them as you're holding them. Let go and put another piece right under the top.

Have the kids dip the straws into blue paint first and stamp it all over the paper. If the paint doesn't show up great, have them press each straw individually against the paper. Add some red paint and your fireworks are done! Add some glitter if you want some sparkle to them.