Counter-height tables are less common and their style is more casual. This allows them to create a more relaxed atmosphere which could be good for certain types of spaces. Also, they work well in small spaces since they appears to be taking less space because of their height and shape. You can use them in the kitchen where they would double as prep spaces.
Another good example of simple design that fit in a variety of interior designs is that featured by Stool_One by Magis. Here you can see it displayed in a contemporary setting where it complements a large kitchen island.
Basically, the first thing you need to think about is in what space the bar stools will be going. This will provide a perfect starting point in your search. Will they be at the kitchen island and be used every day, many times a day? Or will they be tucked away in the basement kitchenette for the occasional holiday party?
Because bar stools are a taller seating piece, they tend to be noticeable. A glossy modern stool or three can go a long way toward making an entire area feel more contemporary, if that is your aim.