I saw these for sale at San Deigo Zoo on the summer holidays for like $20 and I decided I could make them instead so, I did! I bet that's a typical thought for a crafty gal like us =]
Keep repeating the previous step until you have a big enough disk.
The size really depends on how big you want your bowl... mine is about 25cm wide.
Now you have to take your disk and pull the top up and move it around until you have your desired bowl shape. Try using a real bowl as a guide.
(Im really bad at explaining stuff)