I love this idea! How neat! Topic Sentence is green, Supporting details are yellow, and closing sentence is red (Stop!) What a great way to teach this, and it would transition well to essay writing, too!
This is such a great idea from A Cupcake for the Teacher. It's a word work activity that can be used to practice writing sight words or spelling words. It's called rainbow roll-n-write and it's a FREEBIE!