With three pieces of cardboard containers, some tissue paper, glue & paint, you can make this mail box meant for indoor play. All you need is some craft foam and a brad fastener to mail the flag for it and some more craft foam to make some letters to play with.
My son helped me make this and loves to play with it.
You can also check out the fabric valentine envelopes I made for the kids too.
I ended up using acrylic paints on this because tempura paints would not cover thick enough and printing on the packaging would show through. This could be remedied by doing another layer or two of paper mache if you wanted to use tempura paints, or doing 2 coats of acrylic paint worked just fine too.
To make the flag, all I did was cut out a flag from crafting foam and then used the end of a scissors to poke a hole in the mail box and flag, then attached it with a brad fastener.
There will be lot so much imaginative fun to be had!