I would color this page with lots of bright colors to really bring the trolls' fun time to life! I would use bright blues and greens for the trolls' skin, vibrant pinks and purples for the streamers and balloons, and cheerful oranges and yellows for the confetti. For the cake, I would mix and match colors to create a unique and fun design. The colors should create a festive atmosphere, with hints of warmth and joy seeping through. I can almost imagine the trolls’ cheerful laughter as they celebrate and dance around the cake!