I am not the first person to think of this but here is my experience with making one
Step 1: First Off
I tried using toilet paper rolls but they are flimsy and partially fall apart while cutting the lengths. so I decided to pull out the left over Christmas paper and steal the cardboard rolls... on a better note I didn't have to save toilet paper rolls for 2 weeks!
Step 2: Next You Measure the Depth of the Flower Petals and Start Marking Lines and Cutting
after they are all cut start placing them in different ways to get an idea of how you want it to look
Step 3: Glue
I seen a lot of people using hot glue to stick the rolls together but there's always over run and little strings everywhere
I used cheep super glue it works just as fast!
Step 4: A Little Contrast
I used thumbtacks to make the center of the flower
Step 5: Placement
once the flowers are made position them however you like gluing them together along the way
Step 6: Install and Admire
once it is completely glued you want to paint everything then hang it