You can find macramé swings in neutral or pastel colours. We loved this walnut grey macrame swing chair, which has chic deco fringes and comes with a comfy cushion. You can hang it in your balcony.

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and two macrame swing chairs, also available on Amazon for $60 each. Keep in mind that most swing set frames are designed to hold between 400 and 500 pounds when they're in top condition.