Cat House Using Cardboard. Here is the DIY. People have gotten really creative with this idea on Pinterest.
We better not show this one to our cats out of fear of jealousy. This cat owner went all out. Cut a 6 in 15 cm square in the side of the large storage container.
How to make an indoor cardboard cat house.
Styrofoam Insulated Cat House. The answer is you dont. Styrofoam Insulated Cat House. Well this Imgur user decided to build a cat house.