Choose a Dominant Color
Use pink as the main tone with small purple accents, or reverse the balance.
Equal amounts of both colors can make the room feel overly themed.
Add Neutral Furniture
White, cream, pale wood, gray, and black provide visual rest.
Neutral furniture also makes future decor changes easier.
Keep Bedding Simple
Use solid bedding or a small-scale pattern.
Large butterfly bedding may compete with the wall design.
Add Green Sparingly
Leaves, stems, and small botanical details can balance pink and purple.
Use muted green rather than several bright shades.
Limit Matching Accessories
The room does not need pink curtains, rugs, lamps, storage, and furniture.
Repeat the decal colors in one or two smaller objects only.
Use Different Values
Combine pale blush with deeper plum or lavender with muted rose.
This creates depth without adding more color families.
Conclusion
Choose one dominant color, use neutral furniture, and repeat pink or purple only in limited accessories. The butterfly wall should remain the primary decorative feature.