Building a Mutt (http://www.instructables.com/id/Motorized-Uniwheel-Toy-Thing-Mutt/) is great fun, doesn't take but a few dollars in parts, doesn't require any special tools. The following steps show how to build one. If you don't have exactly the same components, then improvise, thats what I did.
Needle nose pliers, screw driver, drill.
jump rope (the one that has metal bearings)
an old dvd/cd player (computer or otherwise) from which you will scavage:
- motor, motor pulley, motor drive belt, rubber grommets
Erector set type metal strips
plastic coated hanger
two small wheels, beads, metal washers
9 volt battery and battery connector
one electric slide switch
Construction time: about 3 to 4 hours