Miniature cards and envelopes are easy to make if you know how to make one of them in a bigger size. There are many envelope tutorials in origami . Search it up on the net and start trying how to...
you can find them in 4kids.com
Well you can get them at Toys r us and also Walmart they both have them and maybe Kmart has them, too. Maybe they have them at a figurines store.
No. Think of the Sahara desert. That is much hotter than a microwave and the animals that live there have not became smaller.
worldworksgames.com have a complete line of buildings, ships, wagons etc for building out of cardstock.