The original design by Pierce Ferriter is phenomenal! I added a hole in the back of each house to insert a set of white LED craft lights for night viewing. I went with white roofs and alternating red and green houses. I used a glue gun to attach the roofs to the houses, as well as to attach the bottom of the houses to a base that I made with my LulzBot TAZ 6. Again, a thank you to Pierce Ferriter for his creativity!