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A Guide to Quilling Flowers by Helen Walter is quite popular, but I have mixed feelings about it. I like the designs in this book, but the book itself isn't that good, in my opinion. It contains wonderful quilling flowers, including detailed explanation of making them: what color and length of strips to use, which quilling shapes to use, and how to arrange them. You can find a lot of interesting ideas there. For example, I used a cactus from this book for my dad's birthday card. The designs depict plants in a very accurate way and succeed to grasp their distinctive features very well.