Such a cool idea! This will help each student feel important, needed, and supported in the classroom. I would maybe allow other students to write complements for their peers as well (but make sure that everyone is included, not just a few people). This can also help to create great bonds between students and teachers. Everyone wants to feel important!
This word building activity travel kit is perfect for toddlers and preschoolers for long car rides and you can customize it with sight words, color words, word families, or whatever your child is currently learning.