Create a vibrant children's room filled with playful colors and whimsical designs. The walls showcase a lively mural of trees and flowers in bright yellows, greens, and reds. Include a cozy red bed, a round red side table with a snack, and a colorful rug. The door is a charming purple with decorative hearts. Add a cheerful atmosphere with a window allowing natural light, and whimsical accents throughout.