"Design a charming wallpaper pattern with cute purple butterflies as the central motif. The butterflies should have a whimsical and playful appearance, with rounded edges and friendly expressions. Arrange them in a repeating pattern across the wallpaper, interspersed with delicate, complementary elements such as small flowers or hearts. Use various shades of purple for the butterflies, and add subtle accents in soft pastels to create a cohesive and inviting design. The overall effect should be light, cheerful, and perfect for a cozy room."