What you need:
10 sheets of cardstock in a matching color
5 sheets of cardstock in another matching color
Paper cutter or scissors
Glue, tacky or hot glue
First cut a circle out of the cardboard, this will hold all the petals of your flower and can be any size you'd like. If it's bigger you'll need more sheets of paper to have a full flower.
Next cut each sheet of paper into fourths. Roll each piece of paper into a cone and glue to hold the shape. This took a while to do because I had to hold each rolled "petal" while it dried. After the petals are done drying glue the petals around the outer edge of the cardboard circle. To make it easier to glue each petal, flatten the end that is getting glued.