I bought a toy kitchen set consisting of pots and pans a few months ago so that Emma could play with it when she came to visit. Since I could not afford to buy a toy oven, I obsessed for months about making one. I finally recently found the right cardboard box to make into an oven. With a little help from acrylic paint and silver duct tape I was able to transform it into this:
The oven door opens up too and is kept closed by the magnetic lock cleverly designed by my husband.
Total cost of materials = $20
Emma's delight when she saw it = priceless