Another recent oddity, but a useful one:
Vermont inventor has made himself a very clever snowblower/Zamboni for use in backyard skating rinks.
If you have $30K to spare, you can order one now! The Mistress wishes she could :->
The gentleman also offers temporary (seasonal) skating rinks for backyard or commercial use. These start at about $500 for a 10'x20' liner system for home use and go up to $500K or thereabouts for a large, refrigerated, commercial-grade one.