Step 1:
You'll need these materials for the cake box:
1) A white paper square of 40x40 cm
2) A long (colored) rectangle of 10x90 cm
3) A piece of transparent plastic, I used plastic from a toy box

Step 8:
Fold into a straight angle.

Step 6:
Fold into a straight angle.
Glue or tape the edges together, also in the next steps.

Step 13:
Done too...

Step 12:
Fold the 4 flaps in half and glue / tape them to the model

Step 11:
Fold the 4 corners inwards.

Step 10:
Prefold over these 4 lines, use the size of the lid as guidance.

Step 9:
And the lid is done.....

Step 5:
Prefold over this line.

Step 7:
Fold into a straight angle

Step 3:
Prefold in half

Step 2:
Fold over this line

Step 4:
Prefold the edges to the centerline.
Then, unfold the fold of step 2

Step 14:
Glue / tape a piece of transparent plastic to the inside of the lid, I used plastic from a fashion doll box.

Done! This is a video tutorial for making the cake box: