As much as I can. Recently made loads of things for a birthday party. A tulle table skirt: tulle is very cheap; table skirts are not. I made the birthday cake (£110 to buy) cost me about £10 in ingredients, and I printed my own cake toppers. I made the decorations, including paper flowers that were being sold on etsy for over £100! I had a lot of compliments. It's all gone into the loft for the next party, including the balloons, which I carefully untied.