Use a pencil to roll up each dollar bill and secure it with a clear rubber band.
Stack the floral foam discs on top of each other and secure together by pushing three skewers down through all layers. Break off any skewer that sticks out the top.
Run two rows of double sided tape around the top tier and start placing rolled bills against the tape.
Cut these lengths from both ribbons: 20 inches, 26 inches, 34 inches. Adhere the narrow ribbon on top of the wider ribbon for each length.
Continue until bills completely surround the floral foam disc. Wrap a piece of ribbon around the bills, pull it somewhat tight, and tape it together in the back.
Repeat with the remaining two layers.
Decorate as desired. If you'd like to make a grad cap, cut a 3x12 inch rectangle of black cardstock and form it into a circle. Secure with hot glue. Glue it onto a 5x5 square of cardstock. Use a brad to attach a tassel made from embroidery floss.
Glue on stickers or any other decorations as desired.