Meaning: The raindrops are falling on the ground and creating different shapes and designs that look like abstract art.
Choice of Words: "Nature's canvas" refers to the natural world as a blank canvas for artistic expression. "Raindrops" are water droplets that fall from clouds during rain. "Paint" means to apply color or a design to a surface. "Abstract art" is a type of art that does not depict real objects, but rather focuses on expressing emotions and ideas. This sentence suggests that raindrops create abstract and expressive designs on the natural landscape.