Bring a pot of water to boil. Pat the flowers dry, pluck the petals to use, if necessary. Combine the carrot and slivered red cabbage in a medium bowl.
Cook the noodles in the boiling water until just tender, about 3 minutes, depending on the thickness of the noodles. Drain and rinse with cold water.
In a large bowl, stir the rice vinegar, sugar and salt, and add the cooked noodles and green onions; toss to mix well.
Fill a large bowl or baking pan with cool water and place next to a cutting board. Spread a smooth textured towel on a cutting board. Have a large plate ready for the finished rolls.
Dip each rice wrapper into the water and swish it just until it starts to become flexible, then place on the towel. For each roll, place a couple of slivers of avocado across the center, leaving 2 inches bare on the left and right sides. Cover the avocado with the carrot mixture, then mint leaves, then place about 1/4 cup of the rice noodle mixture on top of the pile. Carefully place the flowers in a row just above the rest of the filling, gently pressed onto the rice paper.
Fold up the bottom of the round to cover the filling, then fold in the ends. Roll up from the bottom and place on the plate with the flower side up. Place each roll on the plate, not touching the other rolls, and place a well-dampened paper towel on top of them. Wrap tightly with plastic wrap until time to serve.