Hi Debi, I found a bunny house made from a dresser that might work:
This one is awesome- https://www.hometalk.com/31398560/lampshade-upcycle-into-cat-wigwam-teepee?expand_all_questions=1
Here are some ideas. Mine is number 3 :)
Easy, low cost,disposal if needed https://www.youtube.com/watch?v=kPlrvDF7-oU Can't get easier than this https://www.youtube.com/watch?v=U8fg3qzve3E More plus xtras https://www.youtube.com/watch?v=bsh4kFIiHKE More bigger https://www.youtube.com/watch?v=nq_b-bz6HBI Even bigger https://www.youtube.com/watch?v=8G_WxegAwZo
Cat(s) will too what cat doesn't love cardboard or a nice soft t-shirt of yours to lie on. I have low watt heated pads for my older cats they hardly ever get off of them you could add one of these here's link for either self warming https://www.chewy.com/kh-pet-products-self-warming-pet-pad/dp/128077?gclid=EAIaIQobChMIuomh14yq3wIVkv5kCh0z1AXBEAAYASAAEgJ3kPD_BwE OR ELECTRIC https://www.amazon.com/Pet-Products-Bed-Warmer-Small/dp/B001AZSR68/ref=sr_1_2?ie=UTF8&qid=1545160985&sr=8-2-spons&keywords=K%26H+heated+pet+pads&psc=1 Happy Holidays!