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You start by cutting a circle (I used felt for this, but you can use paper as well), then cut the circle in a spiral toward the center. This one is about 2" across, and I don't worry about it being a perfect circle...
Grab the end with a pair of tweezers and start wrapping it around...
Continue wrapping until you get to the end/center of the circle...
Slip it off the tweezers and add a good glob of glue.
Here's what the bottom will look like:
I free-hand cut some leaves from green felt and glued them to the bottom. Super easy. :o)
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I had so much fun experimenting with the two different styles. If you cut the spiral in a wavy line, you get uneven rose petals like this: