There is an excellent series of books by Pepin Press that are just packed with package and display templates. The books even come with a cd-rom of the vector templates so you can use them yourself. The three I have are "Folding patterns for Display and Publicity", "Structural Package Design" and "Special packaging". The stuff in there can be very inspirational.

Years ago I did this matchbox package that looked like a fire track and even had an extending ladder. The matchbox tray slid out the back of the truck.

I really like the idea of practical papercraft. Toys and stuff are cool but I think the value of functionality really hits a home run for this stuff.

Very cool! Nice idea and I love the design. Well done.
It's really wonderful to see you guys taking this stuff further than just toys. Keep it up!

Very sharp looking.