The Garden Igloo Kit. in a few different versions. could be a greenhouse +/or alternative to tent accommodations to house a few more summer retreatants. not particularly cost effective though, in my humble view.
NTS: Use cut up CD's for mosaic projects.// Cut up an old CD and glue to clear ornament. The lights of the tree reflect off the surfaces beautifully. I knew I would find some use for all those old CDs!