Chenille Sparkle Stems
Kids can make their own 4th of July fireworks by using the red, silver and blue colors from this pack of chenille sparkle stems (aka pipe cleaners :D). Either have the kids twist the stems into fireworks shapes or provide glue and wrap them around toilet paper rolls for TNT sticks. You should be able to find these at under $3 for a pack of 100 with about 20 of each color (the packs also have gold and green). The stems also come in packs of 1000.