This may not be EXACTLY what you're looking for, but it is fun and yummy... I made a rice crispy treat cake for my sister once and mailed it to her. I used a Bundt pan and put mini M&Ms in the bottom, then pressed the rice crispy mixture onto it. When it had cooled off, I flipped it out and it looked like a cake with sprinkles on top. It travelled well, was light and didn't cost a fortune to send to her. Good luck!