Sparks! --Kicksleds, that is
Sparks are kicksleds. They're popular in Scandanavia. David Dermott is a helpful popularizer of them over here in Nor-Am.
I made a spark for Henry a couple years ago and posted an article about it here (http://outyourbackdoor.com/article.php?id=11), but, man, there's lots more to explore in this scene!
Sparks are made with thin metal runners to glide on ice or they can be fitted with wider runners for gliding on snow. They're even used in various kinds of racing. Of course.
In Scandiland they're often used like a bike around town on snowy, icy streets and sidewalks in winter. Kids use them to go to school. They easily carry a load in their basket area and can even be used to easily push people along.
Their vibe strongly relates to the sport of Nordic Skate ice touring. Dave Dermott and his friends often combine them on the same outing.
There are several places to buy them here in the US.
Here are some nifty links to explore the world of sparks:
Super Dave's site: http://www.dermott.ca/ski/spark.html
Kicksled Primer: http://www.potku.fi/kepopas/kepopas_eng.htm
Makes, sells sleds in Michigan: http://www.woodsports.net/
Imports wide variety of kicksport stuff including kickbikes: http://www.alaskasparken.com/