This is pretty straightforward, just follow the instruction-dragon's instructions. Also see Divergent Boundaries: http://scratch.mit.edu/projects/39660820/
I made all of the tectonic plates with PhotoShop, the reason they look painted is thanks to the smudge tool, so thank you Adobe for inventing Photoshop! This is a science project for my school project, so I guess credits go to my teacher for giving me the Earth Science Assignment and being awesome!