Skewer two marshmallows on each straw and stand in a glass.
In two separate bowls, melt each candy melt color, one at a time, according to package directions. Once melted, put each color into a separate ziplock bag. DO ONE COLOR AT A TIME.
Holding the end of the straw in one hand and ziplock in the other. Gently squeeze the bag over the marshmallows as you turn the marshmallows. Work quickly.