Cut 12 circles from a sheet of crepe paper, any size you like depending on how big you want the final flower to be. I accordion-folded a strip of paper and cut multiple circles at once. No need to be too precise; freehand circles will do.
Orient each petal so the grain in the paper runs vertically. Apply a bit of glue at the bottom of the petal and pinch it to create small gathers. When the glue has dried, press both thumbs into the center of each petal and stretch the paper to curl the edges inward, forming a bowl shape.
Cut out a small circle of cardstock (about the same size as the petals before you shaped them.) Glue five petals around the outside edge. Then stagger four petals inside that ring, followed by three petals in the middle.
To make a center for the flower, cut a small strip of crepe paper and fold it in half. Cut notches along one long edge of the doubled paper to make fringe. Roll the fringed paper around a toothpick and secure with glue. Finally, glue this piece into the center of the flower.