They are interlocking tiles I found at HomeDepot for about 90 cents (US) per square foot (in packages of 10). They only come in black so I left a foot-wide border. The floor is painted with blue epoxy underneath which didn't last a week before the tires were peeling up the paint. So I repainted the floor and covered it up with tiles!
They're not nearly as classy as the job you did on your floor, but compared to RaceDeck or other tiles I've seen, they are considerably cheaper.
They hold up well to the weight of the vehicles and the floor jack but will tend to unlock if the tires are turned on them. This is an inconvenience more than anything as we do not have a straight entrance (the garage is on an alley) but we normally back into the garage and have learned to do the wheel turnng outside.
