First, prepare strips of diffuser paper in different colors and roll them up with a diffuser pen. Make a round loose roll and glue the end to glue. Then pinch them into various shapes with your fingers. For example, triangles, squares, teardrops and so on. Paste them onto a card and paste a birthday cake. Varied and bright colors are the key to this cake's popularity. Then cut long strips from purple cardstock and paste them onto the card. Paste from the front to the back. Paste round stickers of different colors on the purple cardstock. Finally write birthday wishes inside the card.