Here is an ice bike with a skate blade, in place of the front wheel, and 4 blades around the base to let you go for a ride over frozen surfaces. You can change direction by turning the handlebars. Pedaling in reverse slows you down. The wide base makes sure you get a stable ride.
This ice bike has stainless steel blades and base. It was developed in Buffalo, NY. More information is available on Hammacher.com.