Prepared materials are: A4 paper, pink cardboard, watercolor pencils, markers, glue, solid glue, scissors.

Step 1: Draw a symmetrical and three-dimensional birthday cake pattern on A4 paper as shown in the picture below.

Step 2: Cut along the edges of the birthday cake pattern you drew in the previous step and fold it so that it can be easily unfolded, as shown in the picture below.

Step 3: Next, stand up the cut pattern along the crease and observe if it looks beautiful, as shown in the picture below.

Step 4: Then draw or paste decorations celebrating Happy Birthday on the A4 paper and the pattern, as shown in the picture below.

Step 5: Then use glue or solid adhesive to stick the A4 paper on the pink cardstock, as shown in the picture below.

Step 6: Finally, use watercolors and markers to write "happy birthday" wishes on pink cardboard and cut some balloons and bows with colored paper to stick the decorations on the cardboard, where a beautiful birthday card is finished.

The above is about the production method of the last day greeting card, quick hands to draw up.