Yes, it will be pretty round. How round? That depends on your scissors skills!
What you'll need:
-crayons, colour pencils, etc. (and fixing spray)
-blunt scissors or a blunt knife
Step 1: Cut & Decorate
First, you need to cut out a circle which will be the bottom of your box. Cut along the line drawn by the compass as neatly as you can, otherwise your box won't be very round!
Then, draw a rectangle which will be the "body" of the box. Decorate it as you like.
You can choose their sizes as you wish, just remember:
-The width of the rectangle will be the height of the box.
-The length of the rectangle needs to fit around the circle (multiply the diameter of the circle by pi !)and you need at least 2 cm extra to glue it.
-BEFORE cutting out the rectangle: make sure to leave an extra cm on one length.