Just use the wind slider to adjust the wind. You can flick the penmode variable to make each raindrop have a pen line proving that each raindrop is an individual sprite.
Hey guys, after almost two years of inactivity, I'm back! Yay! I created this to test the features of the clone block. The way it works is that each raindrop duplicates and falls. When it lands, it sets an x value variable and clones a puddle that goes to that x value and cycles through its costumes.