I had some ideas in my head what needed pans. I used paper for them and made a lot of pans in various shape and size. Do you know what the hardest challenge was? It was designing the side of the oval pan. It has a very special form being a truncated cone with ellipse base. It took 45 minutes for me to draw an approximate shape. I was so worth to study advanced geometry at college!
After that came the funny part, filling the pans with delicious stuff.